KR100760105B1 - Method for offering and displaying subtitle news of digital broadcasting - Google Patents

Abstract

The present invention relates to a method for providing and displaying caption news of digital broadcasting, and provides caption news data and caption news information for a specific service field.

According to the present invention, there is provided a caption news providing method for digital broadcasting in which a caption stream including caption news data relating to a plurality of service fields is multiplexed with a broadcast signal and the caption news is transmitted by transmitting the multiplexed and output transport stream. The information indicating that the caption news data is being transmitted is inserted into the user definition area in the caption type field constituting the caption descriptor of the program map table of the service information present in the transport stream. Information about a service field of the caption news is inserted into a text string field of a text field constituting a component descriptor of an event information table of a service information.

As a result, while viewing a broadcast program, the viewer can acquire information on a specific service field through subtitle news suitable for the viewer's preference. In addition, since the viewer takes less time to acquire information in a specific service field, more efficient information can be obtained.

Subtitles, news, descriptors

Description

Method for offering and displaying subtitle news of digital broadcasting

1 is a diagram illustrating an embodiment of displaying a caption and a caption transmitted to a digital broadcasting receiver.

2 shows an embodiment of a program map table syntax that provides information that caption news data is being transmitted.

3 illustrates an embodiment of a subtitle descriptor syntax.

4 is a diagram illustrating information about a type of subtitle according to a value assigned in a subtitle type field.

5 illustrates an embodiment of a component descriptor syntax.

FIG. 6 illustrates an embodiment in which a user-defined region of a component type field is matched with information indicating that information on a service field of caption news is included in a specific component descriptor;

7 illustrates an embodiment of a stream identifier descriptor syntax.

8 is a block diagram showing a configuration of a receiver for receiving and decoding a transport stream.

9 is a view showing an embodiment of a closed caption news list displayed on a screen of a video display device;

10 is a flowchart illustrating a method of displaying caption news of digital broadcasting of the present invention.

11 is a view showing an embodiment in which the caption news is displayed on the video display device of the present invention.

* Description of the symbols for the main parts of the drawings *

800: database 801: subtitle area

803: component region 810: filter control unit

820: PID filter 830: Transmission buffer

840: subtitle decoder 841: preprocessing and filter unit

843: code data buffer 845: subtitle processing unit

847: composition buffer 850: pixel buffer

The present invention relates to a method for providing and displaying caption news of digital broadcasting. In particular, in digital broadcasting, a broadcasting station generates and transmits information on caption news data and caption news for a plurality of service fields as well as general captions related to a current program. In addition, the present invention relates to a method for providing and displaying a subtitle service of digital broadcasting that enables a viewer to watch the subtitle news of a specific field according to a preference.

Digital broadcasting transmitted by a broadcasting station compresses and transmits a broadcast signal in a digital manner rather than an analog manner. Conventional analog broadcasting signals can carry only one image in one radio wave, and audio has to be transmitted in another radio wave. On the other hand, digital broadcasting can carry a plurality of images, audio, etc. in one radio wave, and can compress information without degrading the quality. In the digital broadcasting, four to eight channels may be set in a frequency band of one conventional analog broadcasting channel. In addition, it is easy to control information using a computer connected to the Internet, and it is also possible to interactively output information ordered from the viewer side. Due to the advantages of digital broadcasting, the demand for digital broadcasting of viewers has increased, and according to the increase in demand, broadcasting stations also transmit many programs not only in analog but also in digital manner.

In recent years, the frequency of displaying subtitles on a broadcast screen has increased significantly. For example, in the morning broadcasting, not only the current time information but also the weather information of the day, road information indicating traffic conditions on the main roads, titles of programs currently being broadcast, and the like are displayed on the screen. In addition, even when the broadcast is not morning, subtitles related to the broadcast program are displayed in the form of text at the bottom of the screen of the video display device in the stock channel, sports channel, economic channel, entertainment channel, music channel, and news specialty channel. It became.

However, when the subtitle displayed at the bottom of the broadcast screen is a subtitle related to the program currently being watched, the viewer could acquire only the information of the field related to the program currently being watched through the subtitle. In other words, in order to obtain information related to another field desired by the viewer, the channel had to be switched. As a result, it is difficult for a viewer to obtain information on a field other than the program currently being viewed through the program currently being viewed. For example, in the case where the channel currently being watched is a sports channel, the viewer could acquire only information related to sports in the current channel. This is because in the case of a sports channel, since only broadcast programs related to sports are generally organized, only the captions related to sports are displayed in the subtitle displayed at the bottom of the broadcast screen. Therefore, in order to obtain information related to stocks, viewers had to switch channels to stock channels. Due to the switching of the channel, there has been inconvenience of not being able to watch a sports program in the sports channel.

Meanwhile, data broadcasting (Teletext, MHEG, MHP, etc.) is another method of viewing news in text form in existing digital broadcasting. However, the method of viewing the news in the form of text related to a specific field by using the data broadcasting has been inconvenient that a viewer must search for a sub item in order to find data related to a specific field. In the above case, it was inconvenient to require a lot of time and effort to find a sub-item in a specific field.

Therefore, an object of the present invention is to provide caption news related to a plurality of fields, so that information on a specific field can be obtained according to a viewer's preference regardless of the field of a broadcast program currently displayed on the video display device, thereby providing convenient viewing. The present invention provides a method for providing and displaying subtitle news of digital broadcasting.

In addition, another object of the present invention is to provide a method for providing and displaying caption news of digital broadcasting to reduce time in finding news related to a specific field.

In order to achieve the above object, a method for providing caption news of digital broadcasting according to the present invention includes a caption stream including caption news data relating to a plurality of service fields, multiplexed with a broadcast signal, and transmits the multiplexed output transport stream to transmit caption news. A method of providing closed caption news of a digital broadcast, comprising: inserting information indicating that the closed caption news data is being transmitted into a caption type field constituting a caption descriptor of a program map table of a service information present in a transport stream; And inserting information about a service field into a text field of a component descriptor of an event information table of a service information.

An area in which the information indicating that the caption news data is being transmitted is inserted is a user-defined area in the caption type field.

Information about a service field of the caption news is inserted into a text string field in the text field.

The information on the service field of the caption news is inserted into a text string field in the form of text and is modifiable.

The information indicating that the information on the service field of the caption news is included in the component descriptor may be inserted into a user defined area in the component type field.

The information on the service field of the caption news is characterized in that the information on the service field of the caption news considering the size of the caption.

The tag value of the component tag field constituting the component descriptor may be 1: 1 matched to a packet identifier.

In addition, the caption news display method of the digital broadcasting of the present invention parses a program map table and an event information table from transport stream packets, and includes caption information including a packet identifier inserted into the parsed program map table. And subtitle information including a page identifier inserted into the parsed event information table, information on a service field of subtitle news, and a component tag value in a component area of a database, and displayed on a screen of a video display device. When a specific object is selected in the closed caption news list, a packet identifier and a page identifier corresponding to the selected specific object are read from the database, the transport stream is filtered by the read identifier, the caption news data is decoded, and the decoding is performed. Closed captioned news data It is characterized by consisting of displaying on the screen of the tooth.

The reading of the packet identifier corresponding to the selected specific entity reads the component tag value corresponding to the selected entity from the component region of the database, and converts the packet identifier matching the read component tag value into the caption region of the database. Read out from.

The information on the service field of the caption news is inserted into a text field constituting a component descriptor of the event information table.

The information on the service field of the caption news is characterized in that the information on the service field of the caption news considering the size of the caption.

The caption news list is a list of information on a service field of caption news stored in the database.

The subtitle news list is characterized in that the list of the service area of the subtitle news considering the size of the subtitle stored in the database.

The position at which the decoded caption data is displayed on the screen of the image display apparatus may be changed by a command through a user interface means.

The transport stream may be a stream in which a caption stream including caption news data for a plurality of service fields is multiplexed with a broadcast signal.

Hereinafter, a method of providing and displaying caption news of digital broadcasting of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an embodiment of displaying a caption and a caption transmitted to a digital broadcast receiver. As shown, the broadcasting station generates a caption stream and multiplexes the broadcast signal to be actually displayed (ie, a video signal / audio signal) and transmits the multiplexed subtitle stream. The caption related information is transmitted through a program map table (PMT) of service information (SI). That is, the caption related information is transmitted through the program map table. When the broadcasting station generates a caption stream, the caption stream related to the caption news is simultaneously generated and transmitted. Information related to the caption news is also transmitted through a program map table.

In digital broadcasting, information on channels and program guide information for each channel are provided through service information. The service information includes a program association table (PAT), an event information table (EIT), a program map table, and the like. The tables all have a basic unit called a section, and one or more sections are combined to form a table.

The program map table describes an element of the program for each program number, and indicates a packet identifier (PID) of packets constituting a transport stream (TS) for transmitting the program map table. The program map table includes packet identifier information of a transport stream packet carrying program identification numbers and individual bit strings such as audio and video constituting a program, and packet identifier information carrying program clock reference (PCR) information. (A / V / PCR PID) is specified.

In a digital broadcasting receiver, a caption stream multiplexed with video and audio signals is separated from a transport stream, decoded, and displayed on a screen. That is, after filtering and decoding only a specific subtitle stream packet from the transport stream packet including the subtitle stream packet, the subtitle stream packet is displayed on the screen at a designated position in the form of an OSD (On Screen Display).

2 is an embodiment of a program map table syntax that provides information that caption news data is being transmitted. As shown, there is a subtitling descriptor (subtitling_descriptor ()) which provides information that stream information ESinfo and subtitle news data are being transmitted in the program map table. When parsing the stream information, a packet identifier may be read, and packet elementary stream (PES) filtering is performed using the packet identifier. The subtitle descriptor is a descriptor for informing information about the language type of the subtitle, the type of the subtitle, and the current subtitle news.

FIG. 3 is a diagram illustrating the syntax of the caption descriptor of FIG. 2. As shown, the caption descriptor is composed of a language type field (ISO_639_language_code), a subtitle type field (Subtitling_type), two page identifier fields (Composition_page_id, Ancillary_page_id), and the like.

The language type field allocates 24 bits and includes information on the type of subtitle language. For example, in the case of English, a unique value is given according to the language type of different subtitles, such as 0110 0110 0111 0010 0110 0101. Of course, the broadcasting station must generate and transmit a subtitle stream of a language corresponding to the value assigned to the language type field.

The caption type field is allocated with 8 bits and includes information on the type of caption. As shown in FIG. 4, the caption type field is assigned a different value according to the information on the type of the caption. That is, information on the subtitle type is matched to each value from 0x00 to 0xFF. For example, when the value of the subtitle type is 0x11, it is information called DVB (Digital Video Brodcasting) subtitle for display on a screen having a 4: 3 ratio. When the value of the subtitle type is 0x12, the information is DVB subtitle for display on a screen having a ratio of 16: 9.

When the value assigned to the subtitle type field is any one of 0xB0 to 0xFE, user-defined information is matched as a user-defined area. Therefore, information indicating that subtitle news of a specific field is provided rather than general subtitles related to the program is inserted into the user defined area. For example, when the value of the subtitle type is 0xFE, it is defined as information that subtitle news of a specific field is provided. The information that the subtitle news of the specific field is provided may be assigned to any value of the user defined area.

In the program map table of the service information, the subtitle descriptor simply includes information indicating that subtitle news of a specific field is provided, and does not include information on which subtitle news of a service field is provided. Which service field the subtitle news is provided is included in the component descriptor of the event information table of the service information. That is, if the subtitle descriptor includes information indicating that subtitle news of a specific field is provided, this means that the component descriptor includes information indicating that subtitle news for a specific service field is provided.

5 illustrates an embodiment of a component descriptor syntax. As illustrated, the component descriptor Component_descriptor () is composed of a stream content field (Stream_content) field, a component type field (Component_type) field, a component tag field (Component_tag), a text field (Text_char), and the like.

The stream content field allocates 4 bits and includes information for identifying what kind of stream the stream is, for example, whether it is an audio stream, a video stream, or a subtitle stream. In the case of a subtitle stream, a value of 0x03 is assigned to the stream content field.

The component type field allocates 8 bits and includes information on a component type. In the case of general subtitles, the component type value is 0x10 to 0x23. When the value assigned to the component type field is any one of 0xB0 to 0xFE, user-defined information is matched as a user-defined area. Therefore, as shown in FIG. 6, information indicating that the service field of the caption news is included in the component descriptor is defined in a specific value of the user defined area. For example, when the value of the component type is 0xFE, this means that the component descriptor includes information on a specific service field of caption news.

The component tag field allocates 8 bits, and the component tag value is matched 1: 1 with the packet identifier. The component tag value does not mean a packet identifier but is a value matching the packet identifier. That is, the packet identifier may be derived using the component tag field value. Of course, the packet with the packet identifier is a packet that contains data about closed caption news of a specific service field. The 1: 1 matching relationship between the component tag value and the packet identifier will be described later.

The text field includes two page identifier fields and a text string field (Text_string).

Each page identifier field is allocated 32 bits. The page identifier field includes page identifier information used to group and distinguish data of a caption stream packet into groups. The page identifier field includes a composition page identifier field (Composition-Page ID) including information about the composition page identifier and an auxiliary page identifier field (Ancillary-Page ID) including information about the auxiliary page identifier. In the page identifier field, a page identifier is input in the form of text. This is to reduce debugging since the text field receives input in the form of text. The page identifier field present in the text field has the same value as the page identifier field present in the subtitle descriptor.

In the text string field, information on a service field of caption news is input in the form of text. For example, when subtitle news about soccer is provided in sports, by inputting the text "Sports Football" into the text string field, information about the soccer field in the service field of the subtitle news is input in the form of text. do. The content of the text input in the text string field can be changed as necessary. In other words, text "Sports Football Europe" or any text may be input in the text string field. Compatibility is greatly increased due to the possibility of the change of the content input in the text string field.

In addition, the text string field may include information on the size of the caption as well as information on the service field of the caption news. That is, a subtitle of a size different from the normal size may be required, such as a case where the size of the subtitle is too large to cover the screen, or the subtitle is too small to watch. Thus, a broadcaster can transmit a subtitle stream of normal size, 1.5 times normal size, and 0.5 times normal size. Information about the size of the caption is also input as text in the text string field. For example, if subtitle news about soccer is provided in sports, and the size of the provided subtitle is 1.5 times the normal size, the text input in the text string field may be displayed as "Sports Football (x1.5)". Can be.

Meanwhile, in order to match the component tag value and the packet identifier, a stream identifier descriptor (Stream_identifier_descriptor ()) is used.

7 is a diagram illustrating stream identifier descriptor syntax. As shown, the stream identifier descriptor includes a component tag field (Component_tag). The component tag value is the same as the component tag value included in the component descriptor. The component tag field is included in the stream identifier descriptor, and the stream identifier descriptor is included in the program map table of the service information like the caption descriptor. As described above with reference to FIG. 2, since the packet information is included in the stream information in the program map table, the component tag value matches the packet identifier 1: 1.

8 is a block diagram showing a configuration of a receiver for receiving and decoding a transport stream. As shown, the receiver includes a database 800, a filter control unit 810, a PID filter 820, a transmission buffer 830, a subtitle decoder 840, and a pixel buffer 850.

The database 800 stores subtitle information included in a program map table and an event information table of a service information in a transport stream received by a receiver. The database is divided into a subtitle area and a component area.

The program map table contains information that a packet identifier and subtitle news are currently provided. Therefore, the caption area 801 of the database stores the packet identifier and the information that the caption news is currently being provided.

A page identifier and a component tag value exist in the event information table. The event information table includes information including at least one of information on a service field of the caption news and information on the size of the caption. Therefore, the component area 803 of the database stores page identifiers, component tag values, information on the service field of the caption news, and information on the size of the caption. However, the information about the size of the subtitles may not be stored in the component area 803 of the database.

The filter control unit 810 controls the filtering operation of the PID filter 820 and the preprocessing and filter unit 841. The type of subtitle service field or subtitle size that can be selected by the viewer is displayed on the screen as shown in FIG. 9. The viewer selects one or more objects from the subtitle news list displayed on the screen through the user interface means. The filter controller 810 reads a packet identifier and a page identifier corresponding to the selected entity from the database 800. When a specific object is selected through the user interface means, the filter controller 810 reads the component tag value and the page identifier corresponding to the selected object from the component area 803 of the database. Since the component tag value and the packet identifier match 1: 1, the filter controller 810 reads the packet identifier from the caption area 801 of the database by using the read component tag value. The read packet identifier is output to the PID filter 820, and the page identifier is output to the preprocessing and filter unit 841.

The PID filter 820 receives the transport stream packets, and filters the transport stream packets according to the packet identifier received from the filter control unit 810. Due to the filtering in the PID filter 820, subtitle stream packets are temporarily stored in the transmission buffer 830. For example, the transmission buffer 830 has a size of 512 bytes, and the caption stream packet is output to the caption decoder 840 in units of 192 Kbit / s.

The caption decoder 840 includes a preprocessing and filter unit 841, a code data buffer 843, a caption processing unit 845, and a composition buffer 847.

The preprocessing and filter unit 841 removes the header of the transport stream and the caption PES packet from the caption stream packet, and then performs filtering using the page identifier. The data corresponding to a specific language, a specific service field, and a specific size are read by filtering the PID filter 820 and the preprocessing and filter unit 841. The page identifier is input from the filter controller 810. The caption data after being filtered by the preprocessing and filtering unit 841 is output to the caption processing unit 845 via a code data buffer 843 having a size of 24 Kbytes.

The caption processing unit 845 performs data processing of the caption data and inputs the processed data to the pixel buffer 850. The transfer rate of subtitle data, which is pixel data, is 512 kbit / s to the pixel buffer 850. The caption data stored in the pixel buffer 850 is multiplexed with the actual broadcast signal and displayed on the screen of the video display device. The composition buffer 847 is a buffer to store when the composition of subtitles is required data.

That is, after the above process, the subtitle news of the service field selected by the user in the language and size selected by the viewer is displayed on the screen of the image display apparatus.

10 is a flowchart illustrating a method for displaying caption services in digital broadcasting of the present invention. As shown in step S100, the program map table and the event information table are parsed. The receiver receives a transport stream transmitted by a broadcasting station and parses a program map table and an event information table present in the service information.

In the next step S102, subtitle information is stored in a database. By parsing the program map table, the packet identifier included in the program map table and information on whether current subtitle news is being provided are stored in the subtitle area 801 of the database. By parsing the event information table, information about a page identifier, a component tag value, information on a service field of subtitle news, and a subtitle size included in the event information table are stored in a component area of the database 800. do. However, information on the size of the subtitle is optionally included in the information stored in the component area of the database 800.

In a next step S104, it is determined whether or not a specific object is selected in the subtitle news list displayed on the screen of the image display apparatus. The subtitle news list provided by the broadcasting station is displayed on the screen of the video display device. The subtitle news list may include, for example, sports soccer, sports baseball, stock Nikkei, stock Dow Jones, and the like, which are currently provided subtitle news services. Alternatively, the subtitle news list may include sports soccer (normal size), sports soccer (0.5 times size), sports soccer (1.5 times size), and the like, as well as the service field of the subtitle news. From the caption news list displayed on the video display device, it is determined whether or not a specific object is selected through the user interface means 860. There is more than one specific entity that can be selected via the user interface means 860.

As a result of the determination in step S104, when a specific entity is selected in the subtitle news list, an identifier corresponding to the specific entity selected in step S106 is read. When a specific object is selected from the list displayed on the screen of the video display device through the user interface means 860, the filter controller 810 may identify an identifier corresponding to the object selected from the caption information stored in the database 800. Read out. The identifier is a packet identifier and a page identifier. The filter controller 810 reads the page ID and the component tag value of the selected object from the component area 803 of the database. In addition, the filter control unit 810 reads the identifier ID from the caption area 801 of the database by using the read component tag value. This is because a subtitle stream packet having data relating to a specific service field of a subtitle news or a specific size of a subtitle has a unique packet identifier and a page identifier.

The subtitle news data is decoded using the identifier read in the next step S108. The PID filter 820 filters the received transport stream packets according to the packet identifier read from the database 800 by the filter control unit 810. Subtitle stream packets corresponding to a specific language, service field, and size filtered by the PID filter 820 are temporarily stored in the transmission buffer 830.

After the preprocessing and filter unit 841 removes the header of the transport stream packet and the subtitle PES packet from the stream packet stored in the transport buffer 830, the filter control unit 810 reads the data from the database 800. Specific caption data is read out by filtering according to the issued page identifier. The specific caption data read by the preprocessing and filter unit 841 is output to the caption processing unit 845 via the code data buffer 843, and the caption data is decoded by the caption processing unit 845 and output to the pixel buffer 850. do.

In the next step S110, subtitle news data is displayed on the screen of the image display apparatus. Subtitle data, which is pixel data stored in the pixel buffer 850, is multiplexed with a broadcast signal and displayed on the screen of the video display device.

The position at which the caption news data is displayed on the screen of the image display apparatus is controlled by a caption area adjusting unit (not shown). The caption area adjusting unit bypasses the caption configuration data when there is no command by the user interface means so that the caption data can be displayed in a predetermined area of the video display device. However, when the caption position shift command by the user interface means is input, the caption region adjusting unit converts the caption position data to match the position to display the caption data so that the caption can be displayed in a specific region.

11 is a view showing an embodiment in which a caption related to caption news is displayed on an image display apparatus. As shown, the general subtitles related to the video displayed on the image display apparatus are displayed in the lower area of the screen. In the right area of the image display apparatus, subtitle news for sports soccer, which are subtitle news selected by the viewer, and subtitle news for Dow Jones stock are displayed.

On the other hand, while the present invention has been shown and described with respect to specific preferred embodiments, various modifications and changes of the present invention without departing from the spirit or field of the invention provided by the claims below It can be easily understood by those skilled in the art.

As described above, in the present invention, in transmitting a broadcast signal, a caption stream including caption news data relating to a plurality of service fields is multiplexed with the broadcast signal, and the multiplexed transport stream is transmitted. The transport stream also inserts information about the subtitle stream.

The receiver receives the transmitted transport stream, and filters the transport stream packet by the packet identifier and the page identifier corresponding to the specific object selected according to the viewer's preference in the caption news list displayed on the screen of the image display apparatus. The subtitle news of the specific service field is then displayed on the video display device. The service field of the caption news displayed on the image display apparatus is not related to the broadcast program, and the viewer may acquire information on the specific service field through the caption news suitable for the viewer's preference while watching the broadcast program.

In addition, since the viewer takes less time to acquire information in a specific service field, more efficient information can be obtained.

Claims (22)

A subtitle news providing method for digital broadcasting, comprising: providing a subtitle news by transmitting a transport stream multiplexed with a broadcast signal to a subtitle stream including subtitle news data relating to a plurality of service fields; Inserting information that the caption news data is being transmitted into a program map table (PMT) of a service information (SI) present in the transport stream, And inserting information on a service field of the caption news into an event information table (EIT) of a service information. The method of claim 1, The information indicating that the caption news data is being transmitted is inserted into the caption descriptor of the program map table. The method of claim 2, The information indicating that the caption news data is being transmitted is inserted into a caption type field constituting the caption descriptor. The method of claim 3, wherein And a region into which the information indicating that the caption news data is being transmitted is inserted in the caption type field is a user defined region. The method of claim 1, Information about a service field of the caption news is inserted into a component descriptor of the event information table. The method of claim 5, And information on a service field of the caption news is inserted into a text field constituting the component descriptor. The method of claim 6, And information on a service field of the caption news is inserted into a text string field in the text field. The method of claim 7, wherein And information on a service field of the caption news is inserted in a text string field in the form of text. The method of claim 8 The caption news providing method of digital broadcasting, characterized in that the information on the service field of the caption news inserted in the form of the text can be modified. The method of claim 5, And information on the service field of the caption news is included in the component descriptor is inserted into the component type field. The method of claim 10, The information indicating that a service field of the caption news is included in the component descriptor is inserted into the user defined area in the component type field. The method according to any one of claims 1 and 5 to 11, The information on the service field of the caption news is information on the service field of the caption news considering the size of the caption news. The method according to claim 5, 6, 10 or 11, The tag value of the component tag field constituting the component descriptor is a 1: 1 match with a packet identifier (PID). Parsing a program map table (PMT) and an event information table (EIT) in a transport stream (TS) packet; Subtitle information including a packet identifier inserted into the parsed program map table is stored in a subtitle area of a database, a page identifier inserted into the parsed event information table, information on a service field of subtitle news, and a component tag value. Storing caption information including a in a component area of a database; Reading a packet identifier and a page identifier corresponding to the selected specific object from the database when a specific object is selected from the caption news list displayed on the screen of the video display device; Filtering the transport stream with the read packet identifier and page identifier to decode caption news data; Displaying the decoded caption news data on a screen of an image display device; A subtitle news display method of a digital broadcast. The method of claim 14, Reading of a packet identifier corresponding to the selected specific entity; Reading a component tag value corresponding to the selected specific object from the component area of the database, and reading a packet identifier matching the read component tag value from the subtitle area of the database. How to display caption news. The method of claim 14, And information on a service field of the caption news is inserted into a component descriptor of the event information table. The method of claim 16, And information on a service field of the caption news is inserted into a text string field in a text field constituting the component descriptor. The method according to any one of claims 14, 16 or 17, The information on the service field of the caption news is information on the service field of the caption news considering the size of the caption news. The method of claim 14, The caption news list is a caption news display method of the digital broadcast, characterized in that the list of information on the service field of the caption news stored in the database. The method of claim 14, The caption news list is a caption news display method of the digital broadcasting, characterized in that the list of the service area of the caption news considering the size of the subtitle stored in the database. The method of claim 14, The position at which the decoded caption news data is displayed on the screen of the image display apparatus is changed by a command through a user interface means. The method of claim 14, The transport stream is a caption news display method of digital broadcasting, characterized in that the caption stream including caption news data for a plurality of service fields is a stream multiplexed with a broadcast signal.

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