JP2007251764A - Program navigation system, program navigation method, program of method, recording medium with program recorded thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a program navigation system capable of management of information conversion corresponding to update of program attribute information of broadcasting and of common retrieval without dependency on media and services. <P>SOLUTION: A program attribute information conversion processing part 12 determines update of SI data and an alteration content of program attribute information for every program on the basis of SI data in MPEG-2 TS, converts altered program attribute information to program meta data, and instructs a program meta data base 13 to conduct new registration of program meta data, update, and removal in response to the alteration content of the program attribute information, and further generates also program meta data for on demand distribution and stores it. A navigation information generation processing part 14 generates program contents concerning a program selected by a user and information for retrieving a program utilizing data in the data base 13 and provides it to the user, and further retrieves programs in response to the request of the user, generates information representing the retrieval result and contents of the program, and provides it to the user. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a program navigation system, a program navigation method, a program for this method, and a program for recording the program, which provide a user with a guide service for a program distributed by broadcasting and communication using program metadata indicating the contents of the program. The present invention relates to a recording medium.

  Conventionally, as a program navigation method for guiding a program distributed by broadcasting and communication, for example, there is a method shown in FIG. In FIG. 5, SI (Service Information) describing program attribute information regarding a broadcast program is distributed, and the receiver 1 a displays the program contents based on this and enables program search. I will provide a.

  In addition, with respect to a program provided by a VOD (Video On Demand) service, information can be described and distributed by HTML or XML (extensible Markup Language), thereby enabling program content display and program search in the receiver 1b.

  Also, as shown in FIG. 6, without using SI assigned to a broadcast program, program attribute information such as HTML or XML is separately provided and distributed to the receiver 1 to provide program navigation with a common mechanism. There is also a method.

Non-Patent Document 1 below shows a system that converts program attribute information related to a broadcast program distributed by broadcast waves into XML.
“A Study on Video Content Management Method Using XML Format Metadata”, 2001 IEICE Information and Systems Society Conference Proceedings, p. 26, D-4-9

(1) First Problem In the method shown in FIG. 6, there is a problem that manual work and system scale for newly providing program attribute information of HTML or XML increase. The non-patent document 1 describes a system for converting broadcast program attribute information into XML, and if this is applied to the method of FIG. 6, the problem of work and increase in system scale can be solved. However, the non-patent document 1 only converts the format of the input broadcast program attribute information, and does not manage information conversion corresponding to the update of the broadcast program attribute information.

  For this reason, even if the attribute information of some programs is changed, program metadata relating to other programs that have not been changed may be re-output in a batch with reference to the version number of the updated SI. It becomes.

  In order to provide services such as advanced search and recommendation that do not depend on media, it is assumed that program metadata is stored in a database and used, but the conventional method is unnecessary as described above. Registration of program metadata occurs, resulting in a problem that transactions increase and data update or return of information to the user is delayed.

  In addition, if the program information simply converted and output is stored in the database, there is a possibility that duplicate data of program frames may exist on the database, and the program metadata in the database may be stored. When program information is displayed on a reference external system or receiver, there is a problem that inconsistency occurs between data.

Thus, if program metadata to be output cannot be stored efficiently and accurately in the database, it will be difficult to provide advanced applications such as search and recommendation based on the database, resulting in effective program navigation. It cannot be provided.
(2) Second Problem In the method shown in FIG. 5, navigation of programs provided by broadcasting and VOD is performed independently, and program navigation is closed within each media and service.

  For this reason, it is difficult to search for programs with the content that you want to view in common, regardless of media or services, or to switch to related programs across media and services. There is a problem that is not made.

  The object of the present invention is to solve the first problem and to manage information conversion corresponding to the update of broadcast program attribute information, and to solve the second problem and to provide media and services. A program navigation system, a program navigation method, a program for this method, and a recording medium on which this program is recorded. It is to provide.

In order to solve the first and second problems, the present invention is characterized by the following system, method, program, and recording medium.
(1) In order to solve the first problem, the program navigation system according to claim 1 is a program navigation system that provides a program guide service to a user using program metadata indicating the contents of the program. A database for managing program metadata indicating the contents of a program, an MPEG-2 TS extraction processing unit for extracting MPEG-2 TS in a received broadcast signal, and the extracted continuous stream data in the MPEG-2 TS format. It is determined whether or not SI (Service Information) data included in the data has been updated, and when the SI data is updated, a change in the program attribute information for each program included in the SI data is determined. Attribute information is converted into program metadata, and the program metadata is changed according to the change contents of the program attribute information. And a program attribute information conversion processing unit for instructing the database to perform new registration, update, and deletion.

  The program navigation method according to claim 5 is a program navigation method for providing a program guide service to a user using program metadata indicating the contents of the program, in the continuous stream data in the MPEG-2 TS format for broadcasting. A process of extracting SI (Service Information) included in the process, a process of determining update of the extracted SI, and a change in program attribute information for each program included in the SI when the update of the SI occurs A process of determining, a process of converting the changed program attribute information into program metadata, and a process of instructing the database to newly register, update and delete the program metadata according to the changed contents of the program attribute information, The program metadata stored in the database in response to a data acquisition request or search request from the user. And a process of providing data.

  With the above configuration, the content of the database can be partially changed following the dynamically changed content of the SI. As a result, unnecessary registration does not occur in the database, data can be stored efficiently, and database transactions are reduced.

  Specifically, a process of extracting SI (Service Information) included in continuous stream data in the MPEG-2 TS (Transport Stream) format, and a process of determining update of SI using the version number in the SI data , A process of determining new input, update and deletion of program attribute information for each program included in the SI when an update of SI occurs, a process of converting changed program attribute information into program metadata, A process for instructing the database to newly register, update, and delete program metadata according to the change in attribute information, and a process for returning program metadata held in the database in response to a data acquisition request or search request from a receiver. The contents of the database are partially tracked following the dynamically changed contents of SI. It is intended to further.

That is, SI (Service Information) contained in continuous stream data in the MPEG-2 TS (Transport Stream) format is extracted, the SI is converted into program metadata that can be registered in the database, and is registered in the database. By returning the program metadata held in the database in response to a data acquisition request or search request from the program, the program metadata can be automatically given to the broadcast program, and the broadcast program can be navigated according to the user's request. In the process of converting SI into program metadata and registering it in the database, the update of SI is determined using the version number in the SI data, and when an SI update occurs, the program attribute for each program included in the SI By determining new input, update, and deletion of information and notifying the database of new registration, update, and deletion of program metadata corresponding to the changed program attribute information, the contents of SI that are dynamically changed can be obtained. Accordingly, the contents of the database can be partially changed, and the contents of the program metadata in the database can be updated while reducing the transactions in the database.
(2) Further, in order to solve the first problem, the program navigation system according to claim 2 is characterized in that the program attribute information conversion processing unit in the system according to claim 1 changes the contents of the program attribute information. Is new or updated, the registration status of the program metadata describing the broadcast time zone that overlaps the broadcast time zone described in the program attribute information of the program is determined, and the program metadata that overlaps the time zone is determined. When already registered in the database, the program metadata having the overlapped registered broadcast time zone is deleted from the database.

  According to a sixth aspect of the program navigation method of the present invention, when it is determined that the change content is new or updated in the process of determining the change content of the program attribute information in the method of the fifth aspect, Determining the registration status of the program metadata describing the broadcast time zone that overlaps with the broadcast time zone described in the program attribute information, and when the program metadata that overlaps the time zone is already registered in the database, It is characterized by having a process of deleting from the database the program metadata with the registered broadcast time period overlapping.

  With the above configuration, it is possible to avoid holding program metadata with overlapping program broadcast frames in the database, and to provide consistent program metadata to the user.

  Specifically, the registration status of the program metadata describing the broadcast time zone that overlaps the broadcast time zone described in the program attribute information of the program determined to be new and updated is determined, and the program metadata that overlaps the time zone is determined. When the data is already registered in the database, it has a process of automatically deleting all the program metadata that overlaps the registered broadcast time zone from the database, and the program metadata with overlapping program broadcast frames is retained on the database Configured not to.

That is, in the process of converting SI into program metadata and registering it in the database, the presence of other program attribute information describing a broadcast time zone that overlaps the broadcast time zone described in the attribute information of the program is determined. If it exists, the program metadata previously registered in the database is automatically deleted, so that it is possible to avoid holding program metadata with overlapping program broadcast frames on the database, and to external systems and receivers. On the other hand, consistent program metadata can be provided.
(3) In order to solve the second problem, the program navigation system according to claim 3 is characterized in that the program attribute information conversion processing unit in the system according to claim 1 or 2 is the MPEG-2 TS extraction process. The distribution status of the on-demand distribution program when the broadcast program data such as video / audio included in the MPEG-2 TS extracted by the section is held and the held broadcast program is distributed on demand according to the user's request Is described in the converted program metadata to generate program metadata for on-demand distribution.

  The program navigation method according to claim 7 holds broadcast program data such as video and audio included in the broadcast MPEG-2 TS, and distributes the held broadcast program on demand according to a user request. A process of generating the program metadata for on-demand distribution by describing the distribution status of the on-demand distribution program in the converted program metadata, and the generated program metadata for on-demand distribution In the database.

  With the above configuration, it is possible to guide a program in a form (VOD; video on demand) in which a broadcast program is held and distributed according to a user request. By using the program metadata of each of the broadcast program, the program broadcast in the past, and the program provided by VOD, navigation can be performed in common regardless of the media and the service.

  Specifically, when a broadcast program is held and the held broadcast program is distributed on demand in response to a user request, the distribution status of the corresponding on-demand distribution program is described using the program metadata of the broadcast program. Thus, it has a process of generating program metadata for on-demand distribution, and is characterized by guiding a program in a form in which a broadcast program is held and distributed in response to a user request.

  That is, program metadata described in XML (extensible Markup Language) that can be easily described manually can be processed as program metadata, and program metadata describing the contents of a program such as a VOD service not included in SI. Is stored in the database together with program metadata based on the contents of SI, it is possible to guide programs of communication services such as broadcasting and VOD.

Further, in the system according to the present invention, a broadcast program is held by, for example, a program storage processing unit, and the held program is distributed by a program distribution processing unit in response to a user's request. Then, by rewriting the program metadata according to the distribution status of the corresponding program, it becomes possible to perform program navigation in a service form in which a broadcast program is held and viewed on demand later.
(4) In order to solve the second problem, the program navigation system according to claim 4 relates to a program selected by the user using the data in the database according to claim 1, 2 or 3. Navigation for generating program contents and information for searching for programs and providing them to the user, searching for programs in response to user requests, generating information indicating the search results and program contents, and providing them to the user An information generation processing unit is provided.

  Further, the program navigation method according to claim 8 uses the data in the database according to claim 5, 6, or 7 to generate program content related to the program selected by the user and information for searching for the program. It is characterized by having a process of distributing to a user, a process of searching for a program in response to a user's request, and a process of generating information indicating the search result and the contents of the program and distributing it to the user.

  With the above configuration, it is possible to search for other programs related to the program selected by the user or similar in attributes, and the range of guidance can be expanded to other programs starting from the program selected by the user.

  Specifically, using the program metadata stored in the database, a process of generating navigation information for displaying the program content related to the program selected by the user together with the search operation button and distributing it to the user, and the search operation button When the button is pressed, the process of searching for other programs related to the displayed program or having similar attributes, and the navigation information for displaying the list of the search results and the program contents of each program are generated for the user. It has a distribution process, and expands the range of guidance to other programs starting from the program selected by the user.

That is, it is possible to generate a program navigation screen using program metadata stored in the database, and to search for other related programs with similar or similar attributes from the screen displaying the contents of a certain program on the program navigation screen. To do.
(5) A program according to claim 9 is a program for causing a computer to execute the program navigation method according to any one of claims 5 to 8.
(6) A recording medium according to claim 10 is a computer-readable recording medium in which the program according to claim 9 is recorded.

  With the above configuration, it is possible to prepare program metadata of a broadcast program, a program broadcast in the past, a distribution media such as VOD, and a program with a different service form on a database with a small amount of work. Can be provided.

(1) According to the first to tenth aspects of the invention, the contents of the database can be efficiently changed without any inconsistency following the dynamically changed contents of the SI, thereby reducing database transactions. In addition, the contents of the program metadata in the database can be updated.
(2) According to the second and sixth aspects of the present invention, it is possible to avoid holding program metadata with overlapping program broadcast frames on the database, and to provide consistent program metadata to the user. Can do.
(3) According to the third and seventh aspects of the invention, it is possible to guide a program in a form (VOD; video on demand) in which a broadcast program is held and distributed in response to a user request. By using the program metadata of each of the broadcast program, the program broadcast in the past, and the program provided by VOD, navigation can be performed in common regardless of the media and the service.
(4) According to the inventions described in claims 4 and 8, it is possible to provide advanced program navigation such as search and recommendation without depending on media and services, using program metadata stored in a database. It is possible to expand the program viewing opportunity by changing the viewing between programs provided by different media and services.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. 1 to 4 show that SI, which is attribute information related to a digital broadcast program, is automatically converted into program metadata and stored in a database, and is shared with program metadata related to other video distribution services such as VOD. 1 shows an embodiment of the present invention that realizes program guidance across the two.

  1 shows the configuration of the program navigation system in this embodiment, FIG. 2 shows the flow of SI program metadata conversion processing in this embodiment, and FIG. 3 shows the relationship of program attribute information in this embodiment. 4 shows an example of a program navigation screen in the present embodiment.

  First, an outline of the present embodiment will be described. In the system according to the present embodiment, SI of MPEG-2 TS input to the system is converted into program metadata and held in a database.

  On the other hand, program data such as video and audio included in MPEG-2 TS is held and provided as a VOD service in a form of distributing a program according to a user request. Program metadata along the distribution is generated from the program metadata of the broadcast program.

  In addition, other edited and produced programs such as video packages are registered in the system together with program metadata describing their contents, and the program is provided as a VOD service. In this system, program metadata can be used for broadcast programs, VOD programs, and past broadcast programs, and navigation can be performed in common regardless of media and services.

  As shown in FIG. 1, the system according to the present embodiment includes a transmission facility 10, a network 20, and a receiver 1 on the user side. The transmission facility 10 includes an MPEG-2 TS extraction processing unit 11, a program attribute, and the like. An information conversion processing unit 12, a program metadata database 13, a navigation information generation processing unit 14, a program accumulation processing unit 15, and a program distribution processing unit 16 are provided.

  Among these, components having functions different from those of the conventional system are a program attribute information conversion processing unit 12 that converts SI in MPEG-2 TS into program metadata and registers it in a database, broadcast program, VOD, past The navigation information generation processing unit 14 generates a screen for commonly navigating these programs from the metadata of the broadcasted programs.

  The MPEG-2 TS extraction processing unit 11, the program attribute information conversion processing unit 12, the program metadata database 13, the navigation information generation processing unit 14, the program accumulation processing unit 15, and the program distribution processing unit 16 are not illustrated, for example. The program metadata database 13 is composed of, for example, a memory.

  The MPEG-2 TS extraction processing unit 11 has a function of receiving a broadcast signal and outputting MPEG-2 TS data included in the signal to the outside.

  The program attribute information conversion processing unit 12 has a function of converting SI in MPEG-2 TS into program metadata that can be registered in the database and registering it in the database. In this function, the previously received SI version number is compared with the newly received SI version number, and if it is not the same, it is determined that the SI has been updated and is included in the SI when an SI update occurs. New input, update, and deletion of program attribute information are determined for each program.

  Determination of new input, update, and deletion of program attribute information is performed using an event ID assigned to each program attribute information. That is, the event ID of the program attribute information received and registered previously is held, and if there is no event ID that matches the event ID to be determined (the event ID of the SI received this time) in the held event ID, New registration.

  If there is a matching event ID, the change of the data content is compared with the binary data of the program attribute information.

  On the other hand, the updated received SI is searched for an event ID that matches the event ID of the previously held program attribute information, and if it does not exist, it is determined to be deleted.

  Also, in the program attribute information conversion processing unit 12, when the change contents of the program attribute information for a certain program are new or update registration, the broadcast time overlapping with the broadcast time zone described in the program attribute information (D1). The registration status of the program metadata (D2) of another program describing the band is determined, and if the program metadata (D2) with overlapping time zones is already registered in the database, the registered broadcast time zone is The program metadata database 13 is instructed to delete all duplicate program metadata (D2).

  After instructing to delete the program metadata (D2) of the program with overlapping time zones, the program metadata database 13 is instructed to newly register, update, and delete the program metadata corresponding to the changed program attribute information (D1). To do.

  In addition, the program attribute information conversion processing unit 12 holds a broadcast program, and when the held broadcast program is distributed on demand in response to a user request, the program attribute information conversion processing unit 12 uses the program metadata of the broadcast program to perform the corresponding on-demand distribution. It has a function of generating program metadata for on-demand distribution by describing the distribution status of the program (VOD distribution period, viewing URL, etc.).

  The program metadata database 13 has a function of managing program metadata in accordance with external program metadata registration, update, and deletion instructions, and a function of referring to the contents of program metadata in response to an external request Have

  As shown in FIG. 3, the program metadata database 13 includes program metadata of a broadcast program that has been converted from SI, and past broadcasts regenerated in accordance with the program distribution status using the program metadata. Program metadata of a program and program metadata as a VOD service such as paid video content not included in the SI (program metadata registered manually or by an operator; video package edited or produced in other ways) (Including program metadata describing the contents of these programs) as a common database.

  The navigation information generation processing unit 14 refers to the content of the program metadata database 13 in response to an external request, and generates a navigation screen that commonly provides navigation of broadcast programs, VOD, and previously broadcast programs. Have

  The program storage processing unit 15 has a function of holding program data such as video and audio included in the MPEG-2 TS output from the MPEG-2 TS extraction processing unit 11.

  The program distribution processing unit 16 has a function of distributing the stored program data as a VOD service according to a user request.

  The receiver 1 has a function of receiving navigation information by HTML or the like from the navigation information generation processing unit 14 and presenting it to the user, receiving an operation, and a function of receiving and playing a program requested to be viewed.

  Broadcast signals input to the receiver 1, signals and information between the navigation information generation processing unit 14 and the program distribution processing unit 16 and the receiver 1 are transmitted and received via the network 20.

Next, the operation of the system in this embodiment will be described. The flow of SI program metadata conversion processing (below (4) to (7)) in the program attribute information conversion processing unit 12 will be described with reference to the flowchart of FIG.
(1) The MPEG-2 TS extraction processing unit 11 receives a broadcast and outputs the MPEG-2 TS in the broadcast signal to the program storage processing unit 15 and the program attribute information conversion processing unit 12.
(2) The program storage processing unit 15 holds program data such as video and audio included in the MPEG-2 TS.
(3) The program distribution processing unit 16 prepares to distribute the accumulated program data as a VOD service according to a user request.
(4) The program attribute information conversion processing unit 12 receives the MPEG-2 TS input from the MPEG-2 TS extraction processing unit 11 in step S1 in FIG. 2, and updates the SI in step S2 for the SI included therein. Judgment processing is performed. First, for the input SI, the sub-table version of the received SDT (Service Description Table), BIT (Broadcaster Information Table), EIT (Event Information Table) is stored, and thereafter, a sub-table different from the stored version is stored. Monitor whether it has been received. If a sub-table with a different version number is received, it is determined that the SI has been updated.
(5) Next, the program attribute information conversion processing unit 12 determines whether or not the attribute information for each program included in the sub-table is changed in step S3 when the update result of the SI is updated. Whether or not it is newly input is determined by comparing the event ID given to the attribute information of the previously received program with the event ID of the input information. As a result of the comparison, if the event ID of the input information is the program information of the event ID that has not been received before, it is determined as new registration. If the event ID has been received before, whether the data contents are actually updated is determined by binary comparison of the entire data. Regarding deletion, it is determined whether or not there is an event ID that matches the event ID of the previously held program attribute information in the updated SI, and if it does not exist, it is determined to be deleted.
(6) Next, in the program attribute information conversion processing unit 12, when the change contents of the program attribute information for a certain program is new or update registration, it overlaps with the broadcast time zone described in the program attribute information (D1). The registration status of the program metadata (D2) of another program describing the broadcast time zone to be determined is determined (step S4), and when the program metadata (D2) with overlapping time zones is already registered in the database, The program metadata database 13 is instructed to delete all the program metadata (D2) whose registered broadcast hours overlap (step S5).
(7) Next, the program attribute information conversion processing unit 12 instructs the program metadata database 13 to delete the program metadata (D2) having the duplicate broadcast time period, and then changes to the program metadata information (D1) according to the change contents of the program attribute information (D1). The change operation is determined and instructed (steps S6 to S9). In the case of new registration, in step S7, the program metadata newly converted from the program attribute information (D1) is transmitted to the program metadata database 13 together with the registration instruction. In the case of updating, in step S8, the program metadata newly converted from the program attribute information (D1) is transmitted to the program metadata database 13 together with the update instruction. In the case of deletion, the program metadata database 13 is instructed to delete the program metadata corresponding to the program attribute information (D1) in step S9. Then, the processes in steps S3 to S9 are repeated for the number of programs in the SI whose version has been updated.
(8) The program attribute information conversion processing unit 12 uses the program metadata of the broadcast program for the program distributed from the program distribution processing unit 16 and adds the program metadata by adding the VOD distribution period, viewing URL, and the like. Generate and instruct the program metadata database 13 to register.
(9) The program distribution processing unit 16 accepts registration (by operator operation) of other programs such as video packages as well as programs from the broadcast, and holds and manages them. The program metadata database 13 accepts registration (by operator operation) of not only program metadata from broadcasting but also program metadata describing the contents of other programs such as the video package, and holds and manages this. . Therefore, as shown in FIG. 3, the program metadata relating to each of the broadcast program, the VOD, and the previously broadcast program is stored in a common database (program metadata database 13).
(10) In accordance with a user request from the receiver 1, the navigation information generation processing unit 14 obtains broadcast metadata, VOD, and program metadata related to a previously broadcasted program from the program metadata database 13, and uses an HTML file as screen data. Is returned to the requested receiver 1. As shown in FIG. 4, the screen provided to the receiver 1 displays an initial screen, a broadcast list, a VOD list, a search, a result list, a detail screen, and the like.

  Among these, when the user designates a candidate value that is automatically generated by collecting free search or other user's search history for each attribute of the program on the search screen, broadcasting is performed using data in the program metadata database 13. Searches for and presents programs to be viewed in common regardless of programs, VOD, and programs broadcast in the past.

  On the detailed screen, the performer and genre are displayed as the attribute information of the corresponding program, and by clicking the display location, the program having the same attribute is related to the broadcast program, VOD, and the program broadcast in the past. Search in common. Further, when a similar program search button is pressed, a program whose contents are similar to that of the program displaying the detailed information is searched from the program metadata database 13 by a condition obtained by logically combining conditions related to a plurality of program attributes. Present (search for a similar program by a search formula in which a plurality of program attributes are weighted and connected).

  Through the above operation, SI, which is attribute information related to a digital broadcast program, is automatically converted into program metadata and stored in a database, and shared with program metadata related to other video distribution services such as VOD, so that media and services can be used. It is possible to realize a program guide that straddles.

  Also, a program for causing a computer to execute the program navigation method described in FIGS. 1 to 4 is constructed.

  It is also possible to supply a recording medium recording the program to a system or apparatus, and the CPU (MPU) of the system or apparatus reads and executes the program stored in the recording medium. In this case, the program itself read from the recording medium realizes the functions of the above-described embodiment, and examples of the recording medium on which the program is recorded include CD-ROM, DVD-ROM, CD-R, CD- There are RW, MO, and HDD.

The block diagram of the system in the example of embodiment of this invention. The flowchart which shows the flow of SI / program metadata conversion in the embodiment of this invention. Explanatory drawing which shows the relationship of the program attribute information in the example embodiment of this invention. Explanatory drawing which shows the example of a program navigation screen in the embodiment of this invention. Explanatory drawing which shows an example of the conventional program navigation system. Explanatory drawing which shows the other example of the conventional program navigation system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Receiver, 10 ... Transmission equipment, 11 ... MPEG-2 TS extraction process part, 12 ... Program attribute information conversion process part, 13 ... Program metadata database, 14 ... Navigation information generation process part, 15 ... Program accumulation process part 16 ... Program distribution processing unit, 20 ... Network.

Claims (10)

In a program navigation system for providing a program guide service to a user using program metadata indicating the contents of a program,
A database for managing program metadata indicating the contents of the program;
An MPEG-2 TS extraction processing unit for extracting MPEG-2 TS in the received broadcast signal;
It is determined whether SI (Service Information) data included in the extracted continuous stream data in the MPEG-2 TS format has been updated, and a program for each program included in the SI data when the SI data is updated is determined. The change contents of the attribute information are determined, the changed program attribute information is converted into program metadata, and new registration, update, and deletion of the program metadata are stored in the database according to the change contents of the program attribute information. A program navigation system comprising: a program attribute information conversion processing unit for instructing. The program attribute information conversion processing unit
When the change content of the program attribute information is new or updated, the registration status of the program metadata describing the broadcast time zone that overlaps the broadcast time zone described in the program attribute information of the program is determined, and the time zone 2. The program navigation system according to claim 1, wherein, when the program metadata that overlaps is already registered in the database, the program metadata that overlaps the registered broadcast time zone is deleted from the database. . The program attribute information conversion processing unit
When the broadcast program data such as video / audio included in the MPEG-2 TS extracted by the MPEG-2 TS extraction processing unit is held, and the held broadcast program is distributed on demand according to the user's request, The program navigation system according to claim 1 or 2, wherein a program metadata for on-demand distribution is generated by describing a distribution status of an on-demand distribution program in the converted program metadata. Using the data in the database, the program content related to the program selected by the user and information for searching for the program are generated and provided to the user, the program is searched according to the user's request, and the search result The program navigation system according to claim 1, further comprising: a navigation information generation processing unit that generates information representing the contents of the program and provides the information to a user. In a program navigation method for providing a program guide service to a user using program metadata indicating the contents of a program,
A process of extracting SI (Service Information) included in continuous stream data in the MPEG-2 TS format for broadcasting;
Determining an update of the extracted SI;
Determining a change in program attribute information for each program included in the SI when the SI is updated;
The process of converting the changed program attribute information into program metadata,
Instructing the database to newly register, update, and delete the program metadata in accordance with the change in the program attribute information;
A program navigation method comprising: providing program metadata stored in the database in response to a data acquisition request or a search request from a user. In the process of determining the change content of the program attribute information, when it is determined that the change content is new or updated, the broadcast time zone that overlaps the broadcast time zone described in the program attribute information of the program is described. Determining the registration status of program metadata, and when program metadata with overlapping time zones is already registered in the database, deleting the program metadata with overlapping broadcast time zones from the database; The program navigation method according to claim 5, wherein the program navigation method is provided. The distribution status of the on-demand distribution program when the broadcast program data such as video / audio included in the broadcast MPEG-2 TS is held and the held broadcast program is distributed on demand according to a user's request. Describing the converted program metadata to generate program metadata for on-demand delivery;
The program navigation method according to claim 5, further comprising: registering the generated program metadata for on-demand distribution in the database. Using the data in the database to generate and distribute to the user program content relating to the program selected by the user and information for searching for the program;
The process of searching for a program according to a user request,
8. The program navigation method according to claim 5, 6 or 7, further comprising: generating information representing the search result and program contents and distributing the information to a user.   A program for causing a computer to execute the program navigation method according to any one of claims 5 to 8. A computer-readable recording medium on which the program according to claim 9 is recorded.

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