JP2007305064A - Server, information processing terminal, file transfer method and method, automatic file updating system, method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a server that eliminates the need to manage information about the downloading side separately from a file in order to check if the file is the newest one or to download the file again for comparison; an information processing terminal; a file transfer method and method; and an automatic file updating system, method and program. <P>SOLUTION: A Web server 1 connected to a local machine 2 via a network 3 has an additional information managing part 11 which, in response to a request from the local machine 2, sends to the requesting local machine 2 a certain file that it stores and final update date information showing the time of the last update of the file, either at the same time or separately. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a server, an information processing terminal, a file transfer method and method, a file automatic update system and method, and a program for updating a file downloaded via a network to the latest state.

  In a file management method in a conventional information processing apparatus, a file downloaded via a network and a file created on a local machine are managed without any distinction. That is, the last update date / time, file size, file type (type of application to be used), and the like on the local machine are managed as file information.

In the conventional management method such as the “file transfer method” disclosed in Patent Document 1, information on the last update date and time on the local machine is managed, so that it is possible to check whether the file is new or old without opening the file. Since the file downloaded and saved is handled in the same way as a file created on the local machine, information on the date and time of downloading and saving on the local machine is managed.
JP-A-4-305751

  The file management method in the conventional information processing apparatus has the following problems.

  First, when using a file that has been downloaded and saved on the local machine, in order to check whether the same file has been updated on the Web server from which the file was obtained, obtain the download file. The original information (homepage, URL, etc.) needs to be managed separately from the file body. Furthermore, it is necessary for the user to manually open the browser based on that information, access the source, download the same file again on the local machine, and compare the old and new files.

  The reason is that the file information managed on the local machine manages information such as whether the file was downloaded and obtained, information on the homepage of the source, and when the file was created. This is because there is not.

  The present invention has been made in view of such a problem, and it is not necessary to manage the information of the download source separately from the file or to download and compare the files again in order to confirm whether the file is the latest file. An object is to provide a server, an information processing terminal, a file transfer method and method, a file automatic update system and method, and a program.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a file automatic update system in which a server and an information processing terminal are connected via a network, the server responding to a request from the information processing terminal. A means for transmitting an arbitrary file stored in itself to the requesting information processing terminal, and a last update indicating the last updated time of the arbitrary file stored in response to a request from the information processing terminal. Means for transmitting the date and time information to the requesting information processing terminal, and when the information processing terminal acquires an arbitrary file from the server, the means for requesting the server to transmit the latest update date and time information of the file; Use any file obtained from the server, means for associating and storing in the storage means an arbitrary file obtained from the server and the last update date / time information of the file, or When executing, compare the means for requesting the last update date and time information of the file to the server, the last update date and time information associated with the file to be used or executed, and the newly acquired last update date and time information. Or a determination unit that determines whether the file to be executed is the latest file, and an automatic update unit that requests the server to transmit the file to be used or executed when the determination unit determines that the file is not the latest file. The present invention provides an automatic file updating system characterized by comprising:

  In the first aspect of the present invention, when the information processing terminal obtains the latest file from the server, the pre-update data that saves the file with the same name that has been stored in the storage means until then as the pre-update data It is preferable to have a management unit, and in addition to this, it is more preferable to be able to set whether or not to operate the pre-update data management unit. In addition to these, it is more preferable to have differential data management means for generating differential data between the latest file acquired from the server and the pre-update data, and in addition to this, whether or not to activate the differential data management means More preferably, it can be set.

  In any of the above configurations of the first aspect of the present invention, when using or executing any file acquired from the server, whether or not to activate a means for requesting the server for the latest update date and time information of the file Is preferably settable.

  In order to achieve the above object, according to a second aspect of the present invention, there is provided a server connected to an information processing terminal via a network, which is stored arbitrarily in response to a request from the information processing terminal. Information to the requesting information processing terminal, and in response to a request from the information processing terminal, the last update date / time information indicating the last updated time of any file stored by itself A server characterized by having means for transmitting to a processing terminal is provided.

  In order to achieve the above object, according to a third aspect of the present invention, there is provided an information processing terminal connected to a server via a network. When an arbitrary file is acquired from the server, the end of the file is obtained. Means for requesting the server to transmit the latest update date / time information indicating the time when the file was updated, means for associating an arbitrary file acquired from the server with the last update date / time information of the file in the storage means, and a server When using or executing an arbitrary file acquired from the server, a means for requesting the server for the latest update date / time information of the file, the last update date / time information associated with the file to be used or executed, and the last acquired The determination means for comparing the update date and time information to determine whether the file to be used or executed is the latest file, and the determination means If it is determined that it is not, it is to provide an information processing terminal characterized by having an automatic updating means for requesting the transmission of the file to be used or executed to the server.

  In the third aspect of the present invention, when the latest file is acquired from the server, the pre-update data management means for saving the file with the same name that has been stored in the storage means until now as the pre-update data is provided. In addition to this, it is more preferable to be able to set whether or not to operate the pre-update data management means. In addition to these, it is more preferable to have differential data management means for generating differential data between the latest file acquired from the server and the pre-update data, and it is possible to set whether to operate the differential data management means. Is more preferable.

  In any of the above-described configurations of the third aspect of the present invention, when using or executing any file acquired from the server, whether or not to activate the means for requesting the server for the latest update date / time information of the file Is preferably settable.

  In order to achieve the above object, the present invention provides, as a fourth aspect, an arbitrary file stored in the server connected to the information processing terminal via the network in response to a request from the information processing terminal. Is sent to the requesting information processing terminal, and in response to a request from the information processing terminal, the last update date / time information indicating the last updated time of any file stored by itself is received. The present invention provides a file transfer program characterized in that a process for transmitting to a file is performed.

  In order to achieve the above object, according to a fifth aspect of the present invention, when an arbitrary file is acquired from a server to an information processing terminal connected to the server via a network, the file is updated at the end of the file. Processing for requesting the server to send the latest update date and time information indicating the specified time, processing for associating an arbitrary file acquired from the server with the last update date and time information of the file, and storing it in the storage means, and acquisition from the server When using or executing any of these files, the process of requesting the server's last update date / time information, the last update date / time information associated with the file to be used or executed, and the newly acquired last update date / time Compare the information and determine whether the file to be used or executed is the latest file, and the latest file in the determination process There is provided a file automatic update, characterized in that if it is determined that no, to perform an automatic update process for requesting transmission of the file to be used or executed to the server.

  In the fifth aspect of the present invention, when the latest file is acquired from the server in the information processing terminal, the pre-update data is stored as a pre-update data with the same name as the pre-update file stored in the storage means until then. It is preferable to perform management processing, and in addition to this, it is more preferable to cause the information processing terminal to perform differential data management processing for generating differential data between the latest file acquired from the server and the pre-update data.

  In order to achieve the above object, according to a sixth aspect of the present invention, there is provided, as a sixth aspect, an arbitrary file stored by the server connected to the information processing terminal via the network according to a request from the information processing terminal. Information to the requesting information processing terminal, and in response to a request from the information processing terminal, the last update date and time information indicating the last updated time of any file stored by the server The present invention provides a file transfer method including a process of transmitting to a processing terminal.

  In order to achieve the above object, according to a seventh aspect of the present invention, when an information processing terminal connected to a server via a network acquires an arbitrary file from the server, the file is updated at the end of the file. Processing for requesting the server to transmit the latest update date / time information indicating the recorded time, and processing in which the information processing terminal associates an arbitrary file acquired from the server with the last update date / time information of the file and stores it in the storage means When the information processing terminal uses or executes an arbitrary file acquired from the server, the information processing terminal is associated with the file that the information processing terminal uses or executes The latest update date / time information and the newly acquired last update date / time information are compared to determine whether the file to be used or executed is the latest file. And an automatic update process for requesting a server to transmit a file to be used or executed by the information processing terminal when it is determined that the file is not the latest file in the determination process Is to provide.

  In the seventh aspect of the present invention, when the information processing terminal acquires the latest file from the server, the pre-update data that saves the file with the same name that has been stored in the storage means until then as the pre-update data Management processing is preferably performed, and in addition, it is more preferable that the information processing terminal performs difference data management processing for generating difference data between the latest file acquired from the server and the pre-update data.

  According to the present invention, a server, an information processing terminal, and a file transfer that do not need to manage download source information separately from a file or to download and compare files separately to check whether the file is the latest file. A method and method, a file automatic update system and method, and a program can be provided.

[Features of the invention]
The present invention provides a file download system that can always use the latest file on a local machine by adding information to a file downloaded from a Web server on a network.
The files to be used are various files downloaded from the network (executable files, binary files (document files, presentation files, etc.), ASCII files (text, etc.), etc.).

  In FIG. 1, the Web server 1 manages downloadable files, and for each file, manages last update date / time information indicating “last update date / time of file”. In response to a request from the local machine 2, the Web server 1 provides the last update date / time information of the managed file to the local machine 2 that is the request source.

Similarly, the local machine 2 shown in FIG. 1 adds information (downloaded file identifier) indicating that the file is a downloaded file to the downloaded file (downloaded file), and further adds the file as file information. “URL” and “last update date / time” of the file are attached and stored and managed. The “last update date of file” here is information that can be obtained by the local machine 2 by making a request to the Web server 1 separately from the file body.
In addition, the local machine 2 individually performs settings such as “always update to the latest information”, “save pre-update data”, “output difference information”, etc. for the “download file”.

  When opening or executing a file to which such information is added, the local machine 2 confirms the presence or absence of the file to the Web server 1 that is the download source according to the setting and the last update date and time of the file placed at that time. Request notification. Using the last update date / time information obtained from the Web server 1, the local machine 2 compares the file information of the download file, and if the file of the Web server 1 is updated to a newer file, the new file is downloaded. By saving, the local machine 2 can use the latest file.

  Further, according to the setting of each download file, the local machine 2 can automatically save the pre-update data of the download file and create difference data.

  In this way, each time a user uses a download file, it is necessary for the user to start the browser on the local machine 2 and access the downloaded site to obtain the file and check whether it has been updated. Disappear. That is, when opening or executing the download file, the local machine 2 automatically confirms the latest information.

  Further, when there is an update and the latest file is obtained, the local machine 2 can store and manage “data before update of download file” and create and manage “difference data of download file” depending on the setting.

  Hereinafter, a preferred embodiment of the present invention having the above features will be described.

A preferred embodiment of the present invention will be described. FIG. 1 shows a configuration of a file download system according to the present embodiment. This system has a configuration in which a Web server 1 and a local machine 2 are connected via a network 3.
The Web server 1 includes a download file additional information management unit 11. On the other hand, the local machine 2 includes an automatic file update unit 21, a file management function unit 22, a pre-update data management function unit 23, and a difference data management unit 24.

FIG. 2 shows functions of the respective units of the Web server 1 and the local machine 2.
The download file additional information management unit 11 manages and provides the download file, manages the latest update date / time information of the download file, and provides the download file to the local machine 2. The download file main body and the last update date / time information of the download file can be provided to the local machine 2 at the same time or separately.

  The automatic file updating unit 21, the file management function unit 22, the update data management function unit 23, and the difference data management function unit 24 are executed when the control device (not shown) of the local machine 2 executes the download information management program 20. 2 is formed.

FIG. 3 shows an outline of the operation of the local machine 2. The Web server 1 provides a download file or its last update date / time information in response to a request from the local machine 2.
First, the local machine 2 requests the Web server 1 for the latest update date and time information, and acquires the “URL” and “last update date and time” of the download source of the download file. Further, the local machine 2 requests the Web server 1 to transmit the download file body, and acquires the file itself.

  When the download file is acquired, the local machine 2 indicates the acquired information (“URL” and “last update date”) and the download file in order to manage the file and its latest update date information. Additional setting information including an identifier is attached as file information and the file body is saved.

  When an operation for opening or executing a download file stored in the local machine 2 is performed by the user, the file automatic update unit 21 is activated by the download information management program 20 on the local machine 2. The file automatic update unit 21 performs the following operation to check whether or not the specified file is the latest before actually opening or executing the file. If the file is not the latest, It will be updated to the latest one.

  The automatic file updating unit 21 confirms whether or not the setting for constantly updating to the latest file is made based on the setting information attached to the file. If the setting for updating to the latest file is not made, a message requesting selection of whether or not to check whether the existing file is the latest file is displayed, and the user is prompted to select. When the user selects whether the file is the latest file, the file automatic update unit 21 requests the Web server 1 for the latest update date and time information based on the file information attached to the file, and the latest file Get last updated date and time information. At this time, it is not necessary for the user of the local machine 2 to manually start the web browser, and the file automatic update unit 21 automatically connects the local machine 2 to the web server 1.

  The file automatic update unit 21 checks whether or not the download file stored by itself is the latest, based on the file information managed by itself and the latest information on the latest update date and time acquired. Since this check is performed only by comparing the last update date and time, it is not necessary to acquire the file body.

  When it is confirmed that the download file in the local machine 2 is not the latest, the file automatic update unit 21 requests the Web server 1 to transmit the file in order to obtain the file body, and acquires the latest download file. At this time, it is not necessary for the user of the local machine 2 to manually start the web browser, and the file automatic update unit 21 automatically connects the local machine 2 to the Web server 1.

When the file body is obtained, the file management function unit 22 confirms the setting information of the existing download file, and if the setting “save pre-update data” is set, the pre-update data management unit 23 The update history of the download file is managed by changing the file name of the existing download file and attaching and storing information indicating that the data is the pre-update data.
Further, when the setting for saving the pre-update data is made, it is further confirmed whether or not the setting is for outputting the difference data. If the setting is to output difference data, the difference data management unit 24 generates difference data from the stored “pre-update data” and the newly downloaded file body, and is the difference data of the “download file”. And an “indicating last update date” of each compared file are attached and managed.

  With the above operation, when the designated download file is opened (or executed) in the local machine 2, the updated download file is opened. Depending on the setting, “data before update of download file” and “difference data of download file” are also generated and managed.

The process flow of the download file automatic update system will be described. 4 and 5 show the flow of processing in the download file automatic update system. Prior to the illustrated process, at least one file is downloaded from the Web server 1 to the local machine 2. At that time, two operations of obtaining the last update date and time information and obtaining the file body are performed, and the file and the last update date and time information of the file are obtained in the local machine 2. Note that the “URL” of the download source is also acquired together with the last update date / time information.
The file management function unit 22 includes the last update date and time information and the download source URL of the obtained download file, an identifier indicating that it is a “download file”, setting information for “whether to automatically perform update confirmation”, and , The setting information “whether or not to save pre-update data” and the setting information whether or not to output “difference data” are attached to the obtained file as file information. The file management function unit 22 manages files including all newly added information.

  When the operation of opening the file is executed (step S101), the automatic file update unit 21 is activated by the download information management program 20 (step S102). The file automatic update unit 21 reads the file information attached to the file and determines whether the file is a download file (step S103). If it is a download file (step S103 / Yes), the process proceeds to the next check operation (after step S104). On the other hand, if not (step S103 / No), the file is opened or executed as it is (step S117).

  If it is a downloaded file, the attached file information is read again, and it is confirmed whether or not “whether or not to always update to the latest information” is set (step S104). When the setting to always update to the latest information is made (step S104 / Yes), the setting as to whether or not “save pre-setting data” is checked (step S111).

If the file is not set to “always update to the latest information” (step S104 / No), an inquiry message as to whether to “confirm whether the existing file is the latest file” is displayed, and the user is prompted. Selection is prompted (step S105). When it is selected not to perform confirmation (step S105 / No), the file automatic update unit 21 causes the control unit (not shown) of the local machine 2 to open or execute the file as it is (step S117).
When the confirmation is selected (step S105 / Yes), the file automatic update unit 21 acquires information attached to the file (step S106). The information acquired here is the URL of the file download source and the latest update date and time of the file at the URL. Then, the file automatic update unit 21 accesses the URL included in the acquired information (step S107), acquires the file information of the file from the Web server, and acquires the last update date and time of the file in the URL Web server ( Step S108).
Thereafter, the file automatic update unit 21 determines that the file on the Web server is more than the file on the local machine 2 based on the last update date information in the local machine 2 and the last update date information acquired from the Web server 1. It is confirmed whether it is new (step S109). When the last update date / time of the file on the Web server 1 is later than the last update date / time of the file in the local machine 2 (step S109 / Yes), the file automatic update unit 21 performs the following check, otherwise. In this case (step S109 / No), the control unit (not shown) executes the file as it is (step S117).

  If the file is newer than the file in the local machine 2, the file automatic update unit 21 accesses the URL "of the download source again (step S110).

  The update data management function unit 23 reads the setting information attached to the existing download file, and checks whether the setting is to save the pre-update data (step S111). If the setting is to save pre-update data (step S111 / Yes), the file name of the download file stored in the local machine 2 is changed and managed as "pre-update data" (step S112). The pre-update data is stored with information indicating the original file name and the last update date / time attached. The pre-update data stored in this way is used for managing the download file history.

The file management function unit 22 downloads a file currently placed on the Web server 1. At that time, it is not necessary for the user of the local machine 2 to manually start the web browser, and the file management function unit 22 automatically obtains the file (step S113).
The file management function unit 22 stores the last update date and time information already acquired and the setting information included in the file information attached to the original download file, with the newly downloaded file attached (step S114). .

  The difference data management function unit 24 reads the setting information attached to the download file, and confirms whether or not it is “a setting for saving the pre-update data and a setting for outputting the difference information”. When this setting is made (step S115 / Yes), difference data is generated from the pre-update data saved in step S112 and the file downloaded in step S113. The difference data is managed by attaching an identifier indicating the difference data and information indicating the last update date and time of each original file (step S116).

  As described above, according to the download file automatic updating apparatus according to the present embodiment, the file downloaded to the local machine 2 is updated to the latest file every time it is used, or difference data from the latest file is generated. it can.

  In addition, when updating the file, the user does not have to manually start the Web browser, so that the user does not forget to update the file and opens or executes a file that is not the latest.

In addition, the said embodiment is an example of suitable implementation of this invention, and this invention is not limited to this.
For example, in the above embodiment, the web server and the local machine have a one-to-one configuration, but it goes without saying that a plurality of local machines may be connected to one web server.
In the above embodiment, the local machine executes the download information management program so that each functional unit (file automatic update unit, file management unit, pre-update data management unit, and differential data management unit) is included in the local machine. Although the configuration realized is taken as an example, these functional units may be configured by dedicated hardware.
As described above, the present invention can be variously modified.

It is a figure which shows the structure of the download file automatic update system concerning preferred embodiment of this invention. It is a figure which shows the function structure of a download file automatic update system. It is a figure showing operation | movement of a download file automatic update system. It is a figure which shows the flow of a process at the time of download file execution of the download file automatic update system which implemented this invention suitably. It is a figure which shows the flow at the time of download file execution of the process of the download file automatic update system which implemented this invention suitably.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Web server 2 Local machine 3 Network 11 Additional information management part 20 Download information management program 21 Automatic file update part 22 File management part 23 Data management part before update 24 Differential data management part

Claims (21)

A file automatic update system in which a server and an information processing terminal are connected via a network,
The server
Means for transmitting an arbitrary file stored by the information processing terminal to the requesting information processing terminal in response to a request from the information processing terminal;
In response to a request from the information processing terminal, means for transmitting to the information processing terminal of the request source last updated date and time information indicating the time of the last update of any file stored by itself,
The information processing terminal
Means for requesting the server to transmit the last update date and time information of the file when an arbitrary file is obtained from the server;
Means for associating an arbitrary file acquired from the server with the last update date and time information of the file and storing it in the storage means;
Means for requesting the server for last updated date and time information of the file when using or executing any file acquired from the server;
A determination unit that compares the last update date and time information associated with the file to be used or executed with the newly acquired last update date and time information to determine whether the file to be used or executed is the latest file; ,
An automatic file update system comprising: an automatic update unit that requests the server to transmit the file to be used or executed when the determination unit determines that the file is not the latest file.   The information processing terminal has a pre-update data management unit that, when acquiring the latest file from the server, saves the file with the same name that has been stored in the storage unit until now as the pre-update data. The file automatic update system according to claim 1.   3. The automatic file update system according to claim 2, wherein whether or not to operate the pre-update data management means can be set.   4. The file automatic update system according to claim 2, further comprising difference data management means for generating difference data between the latest file acquired from the server and the pre-update data.   5. The file automatic update system according to claim 4, wherein whether or not to operate the differential data management means can be set.   2. When using or executing an arbitrary file acquired from the server, it is possible to set whether or not to activate a means for requesting the server for the latest update date and time information of the file. 6. The file automatic update system according to any one of 5 above. A server connected to an information processing terminal via a network,
Means for transmitting an arbitrary file stored by the information processing terminal to the requesting information processing terminal in response to a request from the information processing terminal;
Means for transmitting, to the requesting information processing terminal, last update date and time information indicating the last updated time of an arbitrary file stored in response to a request from the information processing terminal. server. An information processing terminal connected to a server via a network,
Means for requesting the server to transmit last update date and time information indicating the time when the file was last updated when an arbitrary file was acquired from the server;
Means for associating an arbitrary file acquired from the server with the last update date and time information of the file and storing it in the storage means;
Means for requesting the server for last updated date and time information of the file when using or executing any file acquired from the server;
A determination unit that compares the last update date and time information associated with the file to be used or executed with the newly acquired last update date and time information to determine whether the file to be used or executed is the latest file; ,
An information processing terminal comprising: an automatic update unit that requests the server to transmit the file to be used or executed when the determination unit determines that the file is not the latest file.   9. A pre-update data management unit that saves a file having the same name that has been stored in the storage unit as a pre-update data by another name when the latest file is acquired from the server. Information processing terminal.   10. The information processing terminal according to claim 9, wherein whether or not to operate the pre-update data management means can be set.   The information processing terminal according to claim 9 or 10, further comprising difference data management means for generating difference data between the latest file acquired from the server and the pre-update data.   The information processing terminal according to claim 11, wherein it is possible to set whether or not to operate the difference data management means.   9. When using or executing an arbitrary file acquired from the server, it is possible to set whether or not to activate a means for requesting the server for the latest update date / time information of the file. The information processing terminal according to any one of 12. To a server connected to an information processing terminal via a network,
In response to a request from the information processing terminal, a process of transmitting an arbitrary file stored by the information processing terminal to the requesting information processing terminal;
In response to a request from the information processing terminal, a process of transmitting last update date / time information indicating the last updated time of an arbitrary file stored therein to the requesting information processing terminal is performed. File transfer program. To an information processing terminal connected to the server via a network,
When obtaining an arbitrary file from the server, a process of requesting the server to transmit last update date / time information indicating the time when the file was last updated,
A process of associating an arbitrary file acquired from the server with the last update date / time information of the file and storing the file in a storage unit;
When using or executing any file acquired from the server, a process of requesting the server for the latest update date and time information of the file;
A determination process for comparing the last update date / time information associated with the file to be used or executed with the newly acquired last update date / time information to determine whether the file to be used or executed is the latest file; ,
An automatic file update program for causing an automatic update process to request the server to transmit a file to be used or executed when it is determined that the file is not the latest file in the determination process.   When the information processing terminal obtains the latest file from the server, it performs a pre-update data management process in which the file with the same name that has been stored in the storage unit until then is saved as a pre-update data. 16. The file automatic update program according to claim 15, characterized in that:   The file automatic update program according to claim 16, wherein the information processing terminal is caused to perform a difference data management process for generating difference data between the latest file acquired from the server and the pre-update data. A server connected to the information processing terminal via the network, in response to a request from the information processing terminal, transmitting an arbitrary file stored by the server to the requesting information processing terminal;
The server has a process of transmitting, to the requesting information processing terminal, the last update date and time information indicating the last updated time of an arbitrary file stored in response to a request from the information processing terminal. Feature file transfer method. When an information processing terminal connected to a server via a network acquires an arbitrary file from the server, a process of requesting the server to transmit last update date / time information indicating a time at which the file was last updated When,
A process in which the information processing terminal associates an arbitrary file acquired from the server with the last update date / time information of the file and stores it in a storage unit;
When the information processing terminal uses or executes an arbitrary file acquired from the server, a process of requesting the server for the latest update date and time information of the file;
The information processing terminal compares the latest update date / time information associated with the file to be used or executed with the newly acquired last update date / time information, and whether the file to be used or executed is the latest file. Judgment processing to judge whether
An automatic file update method comprising: an automatic update process for requesting the server to transmit a file to be used or executed when the information processing terminal determines that the file is not the latest file in the determination process.   When the information processing terminal acquires the latest file from the server, it performs a pre-update data management process for preliminarily saving the same-named file stored in the storage unit as pre-update data. The file automatic update method according to claim 19.   21. The file automatic update method according to claim 20, wherein the information processing terminal performs a difference data management process for generating difference data between the latest file acquired from the server and the pre-update data.

Images