KR101523773B1 - Method and System for providing broadcasting service - Google Patents

Abstract

The present invention relates to a broadcast service providing method and system. A method for providing a broadcast service in a head end system connected to a broadcast receiving terminal through a network, the method comprising: maintaining program information of a broadcast program; Generating a table for a program guide service including the programming information and reference version information for a predefined virtual reference channel; And transmitting the table to the broadcast receiving terminal, wherein the broadcast receiving terminal determines whether to update the previously received table using the reference version information. According to the present invention, there is an advantage that a table for a program guide service can be efficiently updated by using version information about a reference channel.

Headend, EIT, EIT-S, EIT-PF, Reference channel, version information, monitoring

Description

TECHNICAL FIELD [0001] The present invention relates to a method and system for providing a broadcasting service,

The present invention relates to a broadcasting service providing method and system, and more particularly, to a method and system for efficiently updating a table for a program guide.

The past broadcasting service is provided in an analog manner, but it is becoming possible to provide a data broadcasting service capable of providing a high-quality digital broadcasting service and additional data by improving video processing technology, network transmission technology, and processing performance at a broadcast receiving terminal.

Currently, the digital broadcasting standard is divided into DVB-MHP (Digital Video Broadcasting-Multimedia Home Platform) and ATSC-DASE (Advanced Television Systems Committee).

In recent years, studies on digital broadcasting standards have progressed actively, and a broadcasting signal including video, audio, and data has been compressed into a digital signal, thereby enabling multi-channelization of TV broadcasting.

In addition, as the related applications develop, not only broadcasts such as weather, fortune, news, securities, e-mail, electronic program guide (EPG), TV shopping, banking, A data broadcast service that can directly and indirectly provide content related to the service is provided.

In this way, a standard for broadcast service information between a broadcasting company and a broadcast receiving terminal has become necessary as well as an effective method for managing various broadcast services with diversification of contents in addition to digitalization of a broadcasting system. According to this demand, DVB-SI (Digital Video Broadcasting-Service Information) has been proposed as a standard for digital service information.

Specifically, DVB-SI is one of standards for transmitting meta information such as channel list, channel tuning information, and programming information among digital broadcasting transmission standards.

The SI tables defined in the DVB standard include Network Information Table (NIT), Bouquet Association Table (BAT), Service Description Table (SDT), Event Information Table (EIT), Time and Date Table (TDT) ), And Time Offset Table (TOT).

The EIT includes data related to an event such as a name, a start time, and a duration of an event (broadcast program) provided in each service.

In more detail, the EIT includes program information of each broadcast channel, for example, broadcast program information provided by each broadcast channel, summary story, protagonist, genre, and rating of the broadcast program.

The EIT is an EIT-Schedule (EIT-Schedule) in which broadcast program detailed information provided for a predetermined period of each broadcast channel is classified by a preset time interval (for example, four days according to the DVB SI standard) Lt; / RTI >

The EIT-S additionally includes broadcasting version information for determining whether the detailed program information is changed, that is, broadcasting version information for each sub-table as well as program detailed information included in each broadcasting channel of the time period.

According to the DVB SI standard, if the detailed program information included in a specific sub table is not changed, broadcast version information of the corresponding sub table is maintained as it is. If the detailed program information is changed, Is changed to a different value.

For example, when there are k channels and EIT-S includes n time intervals, broadcast version information may exist for each broadcast channel and for each time interval by kxn. At this time, if the detailed program information of the n 'th time period (1? N? N. N) of the specific channel k' is changed, the broadcasting version information of the corresponding sub table is also changed.

Recently, the number of channels for providing broadcast services has increased, and detailed information on broadcast programs has been provided in various languages, so the amount of information in EIT-S is also increasing.

Since the amount of EIT-S information is large, the EIT-S generally has a long repetitive transmission period, and the broadcasting terminal stores the received EIT-S at a predetermined point in time.

The broadcast receiving terminal stores an EIT-S including program information of each broadcast channel, and provides an EPG service according to a user's request.

In the EPG service, in order to provide accurate programming information to the user, the broadcasting terminal compares the repeatedly transmitted EIT-S with the previously stored EIT-S, and if there is a change in the programming information, And updates the part where the program information is changed.

At this time, the broadcast receiving terminal compares k × n broadcast version information included in the previously received EIT-S with k × n broadcast version information of the newly received EIT-S to determine whether to update the EIT-S do.

However, when the EIT-S is received from the head-end system in a situation where the EIT-S includes a lot of information, that is, in a situation where the number of k x n is very large, Repeating this comparison process every cycle has a problem of increasing the load on the broadcast receiving terminal.

For this reason, if the repetition period of the EIT-S is set too long, the broadcasting terminal can not reflect the changed programming information, thereby providing the user with erroneous program information

Further, the above problem is not solved by the case where the EIT is provided in the EIT-S scheme including the broadcast program detailed information for a long period of time, but also the detailed information of the broadcast program currently provided by each broadcast channel EIT-PF (EIT-Present / Following) method.

The present invention proposes a broadcasting service providing method and system for efficiently updating a table for a program guide in a DVB-SI environment in order to solve the problems of the related art as described above.

It is another object of the present invention to provide a broadcasting service providing method and system capable of efficiently providing a table for a program guide without increasing the loads of the headend system and the broadcasting terminal.

According to another aspect of the present invention, there is provided a method of providing a broadcast service in a head end system connected to a broadcast receiving terminal through a network, the method comprising: maintaining program information of a broadcast program; Generating a table for a program guide service including the programming information and reference version information for a predefined virtual reference channel; And transmitting the table to the broadcast receiving terminal, wherein the broadcast receiving terminal determines whether to update the previously received table using the reference version information.

According to another aspect of the present invention, there is provided a method of providing a broadcast service at a broadcast receiving terminal connected to a head end system via a network, the method comprising: Receiving a first table including first reference version information for the first table; Storing the received first table; Comparing the first reference version information with the second reference version information for the reference channel included in the second table transmitted from the head end system at the second time point; And updating the first table in accordance with the changed programming information when the first and second reference version information are different from each other.

According to another aspect of the present invention, there is provided a head end system connected to a broadcast receiving terminal via a network, the head end system comprising: a program information storage unit for storing program information of a broadcast program; And generating a table for the program guide service including the programming information and the reference version information for a predefined virtual reference channel, and when the programming information is changed, generating a table in which the reference version information is updated A head end system including a generating unit is provided.

According to the present invention, since the EIT update is determined using the version information of the virtual reference channel preset in the broadcast receiving terminal, the EIT update can be made as close to real time as possible.

Also, according to the present invention, since the EIT update is as close as possible to the real time at the receiving end but the version information of all the EITs is not always compared at all times, the load of the receiving end is not increased normally.

Further, according to the present invention, it is possible to quickly detect a time interval in which the configuration information is changed by using the version information of the reference channel.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of the present invention, the same reference numerals are used for the same means regardless of the number of the drawings.

1 is a diagram illustrating a broadcast service providing system according to an embodiment of the present invention.

1, a broadcast service providing system according to the present invention includes a head end system 100 and a plurality of broadcast receiving terminals 102-1 to 102-n connected to the head end system 100 via a network, n, hereinafter referred to as " 102 ").

Here, the network may include a wired network including the Internet, a dedicated line, a cable broadcasting network, and a wireless network including a wireless Internet, a mobile communication network, a terrestrial broadcasting network, a satellite broadcasting network, and a satellite communication network. As a broadcasting network.

The head-end system 100 provides a broadcast program according to preset program information to the broadcast receiving terminal 102 corresponding to the subscriber.

The head-end system 100 converts broadcast signals for various broadcast channels into a predetermined format (for example, a transport stream according to MPEG-2) and transmits the transport stream to the broadcast receiving terminal 102.

In addition, the head-end system 100 performs a scheduling function for a broadcast program and a scrambling function for restricting reception so that no other user can access the subscriber.

Further, the headend system 100 may provide an Internet service and various communication services by having a separate communication server (for example, a return path server) for processing a user's request through an uplink channel.

The broadcast receiving terminal 102 tunes and displays a broadcast signal received from the headend system 100.

Here, the broadcast receiving terminal 102 may be a set-top box that decodes a broadcast signal and executes an application coupled with data, but is not limited thereto.

The broadcast receiving terminal 102 processes the broadcast program (video, audio, and data) corresponding to the channel selected by the user among the tuned broadcast signals and provides the processed program to the user.

In addition, the broadcast receiving terminal 102 can provide an interactive service.

Here, the interactive service may include weather, fortune-telling, news, securities, e-mail, electronic program guide (EPG), TV shopping, banking, telephone service, VOD portal and Internet search.

According to the present invention, the headend system 100 may generate various tables for broadcasting service according to a predetermined digital broadcasting standard and transmit the table to the broadcasting terminal 102.

For example, in accordance with the DVB-SI standard, the head-end system 100 receives the programming information from each broadcasting company, and uses the programming information to record the event (broadcasting program) provided in each broadcasting channel To the broadcast receiving terminal 102, an EIT (Event Information Table) including the name, start time, duration, and detailed information about the broadcast program.

Generally, the headend system 100 transmits a table for the program guide service to the broadcast receiving terminal 102 in an EIT-S manner.

As shown in FIG. 2, the general EIT-S includes programming information provided for a predetermined period (for example, 16 days), that is, detailed information about a broadcast program provided by each broadcast channel during the corresponding period.

Also, the EIT-S includes broadcast version information corresponding to each broadcast channel of a preset time interval (4 days according to the DVB SI standard).

For example, if the EIT-S contains the programming information of the A, B and C channels for 16 days, EIT-S is 100.1 for the A channel in the first time period (from the present time to the forth day) 101.2 for the B channel, and 102.1 for the C channel.

The broadcasting version information may be separately set for each of the second to fourth time periods.

In this case, when the number of broadcasting channels is k (k is a natural number equal to or greater than 1) and the time interval is divided into n (n is a natural number equal to or greater than 1), EIT-S may include kxn sub- -S can be set to k x n broadcast version information.

The head-end system 100 periodically transmits the EIT-S including broadcast version information to the broadcast receiving terminal 102.

As described above, since the EIT-S includes a large amount of information, the broadcast receiving terminal 102 previously stores the EIT-S provided at a predetermined time (for example, at the time when the first time interval starts).

Conventionally, the broadcast receiving terminal 102 compares k × n individual broadcast version information of the EIT-S received from the head end system 100 and k × n individual broadcast version information stored in the previously stored EIT-S And updates the previously stored EIT-S when there is a difference in broadcasting version information.

However, as shown in FIG. 3, the head-end system 100 according to the present invention may include version information (hereinafter, referred to as " version information ") of a preset virtual reference channel in addition to individual broadcast version information for each broadcast channel in a preset time interval. (Referred to as 'reference version information'), and transmits the EIT-S to the broadcast receiving terminal 102.

In this case, the reference version information is updated according to the program information change of each broadcast channel. According to an embodiment of the present invention, when any one of the program information of each broadcast channel is changed, It is possible to generate the EIT-S including the previous EIT-S and other reference version information.

That is, when at least one program information of a broadcast channel changes in a predetermined time period, the headend system 100 updates the broadcast version information corresponding to the corresponding time period and the broadcast channel, and also updates the reference version information do.

In the case of using the reference version information, the broadcast receiving terminal 102 does not have to compare all individual broadcast version information of the periodically received EIT-S with individual broadcast version information of the previously stored EIT-S, It is possible to determine whether it is necessary to update the previously stored EIT-S by monitoring only the reference version information.

Accordingly, the process for updating the EIT-S in the broadcast receiving terminal 102 can be efficiently performed.

Hereinafter, the configuration of the head end system 100 and the broadcast receiving terminal 102 according to the present invention will be described in detail with reference to FIG. 4 to FIG.

4 is a diagram showing a detailed configuration of a head end system according to the present invention.

4, the head end system 100 according to the present invention includes an AV receiving unit 400, an AV encoding unit 402, a programming information receiving unit 404, a table generating unit 406, a multiplexer 408, A modulator 410, an up-converter 412, and a dispatcher 414.

The AV receiver 400 receives broadcast signals including audio, video and data provided by each broadcasting company. In addition, the AV receiver 400 collects and manages broadcast signals and outputs them to the AV encoding unit 402.

The AV encoding unit 402 converts the received broadcast signal into a predetermined format. At this time, the AV encoding unit 402 may convert the broadcast signal into MPEG2-TS (Moving Picture Experts Group2-Transport Stream) format corresponding to the digital broadcasting standard.

On the other hand, the programming information receiver 404 receives programming information for the broadcasting programs provided by the respective broadcasting companies.

Herein, the programming information may include a name, a start time, and a duration of a broadcast program provided by each broadcast channel, and may further describe a broadcast program such as a summary story, a main character, a genre, And the like.

In the following description, the above-described information on each broadcast program is defined as detailed program information.

The table generating unit 406 generates a table relating to a broadcast program using the above-described program information.

In the present invention, the table may be an EIT for providing a program guide service, and may preferably be EIT-S.

In the following description, the table generating unit 406 according to the present invention generates EIT-S.

3, the table generator 406 according to an embodiment of the present invention includes an EIT-BCH including version information on a predetermined virtual reference channel as well as broadcasting version information corresponding to each broadcasting channel in a predetermined period, S is generated.

Although not shown in the figure, the EIT-S may include broadcast program detailed information provided by each broadcast channel.

As shown in FIG. 3, when the EIT-S is divided into four time intervals, the reference version information according to the present invention is set only for a single time interval (for example, the first interval) regardless of the time interval .

The reference version information is set reflecting the programming information included in the current EIT-S, and when the programming information is changed, the reference version information is newly updated.

That is, the table generating unit 406 can generate the EIT-S in which the reference version information is updated when any one of the broadcast programs provided by each broadcast channel is changed.

For example, as shown in FIG. 3, when the reference version information is 200.1 in the EIT-S generated using the knitting information at the first time point and there is a change in the knitting information at the second time, 406 may generate an EIT-S whose reference version information is updated to 200.2.

The generated EIT-S is periodically transmitted to the broadcast receiving terminal 102. The broadcast receiving terminal 102 stores the received EIT-S at a predetermined time, And the reference version information of the previously stored EIT-S to determine whether to update the previously stored EIT-S.

Meanwhile, as shown in FIG. 5, the table generating unit 406 may generate EIT-S including reference version information for each time interval number.

That is, when the EIT-S is divided into n time intervals, the table generating unit 406 generates n reference version information corresponding to each time interval.

Here, the reference version information for each time interval is updated in accordance with the change of the combination information in the corresponding time interval.

For example, if the EIT-S generated at the first time includes the reference version information of 201.0, 202.0, 203.0, and 204.0 for the first to fourth time intervals, and at the second time, When the programming information is changed, the table generating unit 406 confirms this and generates the EIT-S updated with the reference version information corresponding to the second time period to 202.1.

In FIG. 3, when the version information of the reference channel is updated, the broadcast receiving terminal 102 performs a process of comparing broadcast version information of all time intervals.

However, when the EIT-S shown in FIG. 5 is transmitted to the broadcast receiving terminal 102, since the reference version information is provided for each time interval, the broadcast receiving terminal 102 broadcasts only the changed time period It is possible to compare the version information and efficiently perform the EIT-S update.

Although the EIT is described as being provided in the EIT-S in the above description, the head-end system 100 may include an EIT-S including information on the current time and the next time as shown in FIG. 6, -PF, version information on the reference channel may be added to the EIT-PF and transmitted to the broadcast receiving terminal 102.

Referring again to FIG. 4, the multiplexer 408 multiplexes the AV signal and table information provided by the AV encoding unit 402 into one broadcastable signal, as described above.

The modulator 410 modulates the multiplexed broadcast signal according to a predetermined broadcast medium (for example, terrestrial wave, cable, satellite, etc.), and the up-converter 412 converts the modulated signal into a frequency Converting is performed.

The sending unit 414 sends out the upconverted signal.

FIG. 7 is a diagram illustrating a detailed configuration of a broadcast receiving terminal according to a preferred embodiment of the present invention.

7, the broadcasting terminal according to the present invention includes a tuner 700, a demodulator 702, a demultiplexer 704, an audio signal processor 706, a video signal processor 708, a storage 710, And a table monitoring unit 712.

The tuner 700 tunes to a predetermined frequency to selectively receive a broadcast signal for at least one broadcast channel. According to the present invention, the tuner 700 can receive the EIT-S that the head-end system 100 periodically transmits.

The demodulator 702 demodulates the signal received by the tuner 700. [

The demodulated signal may include audio and video signals, as well as various tables for providing broadcast services, in particular EIT-S for program guide services.

The demultiplexer 704 extracts and outputs each audio signal, video signal, and EIT-S from the demodulated signal. This can be done through Demuxing and Section Filtering.

The audio signal processor 706 converts the audio signal output from the demultiplexer 704 into a digital signal and an analog signal, and transmits the analog signal to the speaker 720.

The video signal processing unit 708 converts the video signal extracted from the demultiplexer 704 into a decoded and analog signal and transmits the decoded analog signal to the display unit 722.

Meanwhile, the EIT-S extracted from the demultiplexer 704 is for providing a program guide service to the user, and the storage unit 710 according to the present invention stores the EIT-S received at the initial time.

Here, the EIT-S received at the initial time point (hereinafter, the first EIT-S) may be the EIT-S transmitted at the start of the corresponding period when the EIT-S includes the scheduling information for the predetermined period.

However, it should be apparent to those skilled in the art that the EIT-S transmitted at a preset reference time point can be stored in the storage unit 710 without being limited thereto.

When the headend system 100 periodically transmits the EIT-S including the program information of the current broadcast channel, the table monitoring unit 712 compares the reference version information of the previously stored first EIT-S with the currently received EIT- S, and determines whether to update the first EIT-S according to the comparison result.

If the EIT-S includes the reference version information for one time interval as shown in FIG. 3, the table monitoring unit 712 updates all broadcast versions of the first EIT-S S is updated by comparing EIT-S information with all broadcast version information of the currently received EIT-S.

If the EIT-S includes the reference version information corresponding to each time interval as shown in FIG. 5, the table monitoring unit 712 first checks the reference time information for another time interval, And compare broadcast version information of the currently received EIT-S with the first EIT-S only for different time periods.

In this way, the EIT-S updated by the table monitoring unit 712 is stored in the storage unit 710, and the program guide service according to the updated EIT-S can be provided at the request of the user.

Hereinafter, a table providing process according to the present invention will be described in detail with reference to FIG.

8 is a flowchart illustrating a table providing process according to the present invention.

8 is a view for explaining a case in which the EIT-S includes one reference version information.

Referring to FIG. 8, the headend system 100 receives scheduling information from each broadcasting company (step 800).

The head-end system 100 generates an EIT-S including version information on the preset programming information and the preset virtual reference channel (step 802).

Then, the headend system 100 transmits the EIT-S to the broadcast receiving terminal 102 (804).

The broadcast receiving terminal 102 stores the received EIT-S (step 806), and provides the program guide service using the stored EIT-S (step 808).

Meanwhile, the head-end system 100 determines whether the programming information is changed (step 810). If there is a change in the programming information, the head end system 100 generates the updated EIT-S (step 812).

The headend system 100 transmits the EIT-S having the updated reference version information to the broadcast receiving terminal 102 (step 814) and the broadcast receiving terminal 102 transmits the EIT-S reference channel version of the EIT-S stored in step 806 And the reference version information of the newly received EIT-S are different (step 816).

If the respective reference version information are different from each other, the broadcast receiving terminal 102 compares the individual broadcast version information of the newly received EIT-S with the individual broadcast version information of the previously stored EIT-S (step 818) And updates the EIT-S by reflecting the changed information (step 820).

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

1 is a diagram illustrating a broadcast service providing system according to a preferred embodiment of the present invention.

2 is a diagram showing the structure of a general EIT-S;

3 is a diagram illustrating an example of an EIT-S structure according to a preferred embodiment of the present invention.

4 is a diagram showing a detailed configuration of a head end system according to the present invention;

5 is a view showing another example of the EIT-S structure according to the present invention.

6 illustrates an example of an EIT-PF structure according to the present invention.

7 is a view showing a detailed configuration of a broadcast receiving terminal according to the present invention;

8 is a flowchart illustrating a table providing process according to the present invention.

Claims (15)

A method of providing a broadcast service in a head end system connected to a broadcast receiving terminal via a network, Maintaining programming information of a broadcast program; Generating a table for a program guide service including the programming information and reference version information for a predefined virtual reference channel; And And transmitting the table to the broadcast receiving terminal, Wherein the table includes broadcast version information corresponding to each broadcast channel in a predetermined time interval and reference version information corresponding to the virtual reference channel in the time interval, Wherein the virtual reference channel is a channel representing a change in the program information of each broadcast channel included in the time interval and the reference version information is updated when at least one of the program information of each broadcast channel is changed in the time interval And, Wherein the broadcast receiving terminal determines whether to update a previously received table using the reference version information. The method according to claim 1, Wherein the table generation step generates a table in which the reference version information is updated when the programming information is changed. The method according to claim 1, Wherein the table includes detailed information on a broadcast program provided by each broadcast channel. The method of claim 3, Wherein the table generating step generates a table in which the reference version information is updated when the program information for at least one broadcast channel is changed in the time period. The method of claim 3, Wherein the table includes n time intervals (where n is a natural number of 1 or more), and the reference version information is provided corresponding to the time interval. 6. The method of claim 5, Wherein the table generation step generates a table in which reference version information corresponding to a time interval in which the programming information is changed is updated when programming information of at least one broadcast channel is changed in a predetermined time period. The method according to claim 6, The broadcast receiving terminal stores the first table received at the first time point. When the second table is received at the second time point, the broadcast receiving terminal compares reference version information for each time interval of the first and second tables, And determining whether to update the previously stored first table by comparing the broadcast version information in different time periods with version information. The method according to claim 1, Wherein the table is at least one of Event Information Table-Schedule (EIT-S) or Event Information Table-Present (EIT-PF). A method for providing a broadcast service in a broadcast receiving terminal connected to a head end system via a network, (a) receiving, at a first time point, a first table including programming information of a broadcast program from the headend system and first reference version information for a preset virtual reference channel; (b) storing the received first table; Comparing the first reference version information with the second reference version information for the virtual reference channel included in the second table transmitted from the head end system at the second time point; And And updating the first table in accordance with the changed programming information if the first and second reference version information are different, Wherein the first and second tables comprise k broadcast version information corresponding to k broadcast channels (k is a natural number equal to or greater than 1) in a predetermined time interval and first broadcast version information corresponding to the first reference channel in the time interval And second reference version information, Wherein the virtual reference channel is a channel representing a change of program information of each broadcast channel included in the time interval and the first and second reference version information is updated in accordance with program information change of each broadcast channel in the time interval The method comprising: 10. The method of claim 9, Wherein the first and second tables include detailed information on a broadcast program provided by each broadcast channel. 11. The method of claim 10, Wherein the second reference version information is set different from the first reference version information when at least one of the k broadcast version information is changed. 12. The method of claim 11, The first table updating step may include comparing k broadcast version information included in the first table and k broadcast version information included in the second table when the first and second reference version information are different from each other And transmitting the broadcast service. 11. The method of claim 10, Wherein the first and second tables include n time intervals (where n is a natural number equal to or greater than 1), the first and second reference version information being provided corresponding to the n time intervals, Wherein the first and second reference version information comparison step compares n first reference version information and second reference version information included in the first and second tables, respectively. 14. The method of claim 13, Wherein the first table updating step updates k * n pieces of broadcast version information included in the first table to k * n pieces of broadcast version information included in the second table when the first and second reference version information are different from each other, Respectively. A headend system connected to a broadcast receiving terminal via a network, A program information storage unit for storing program information of a broadcast program; And Generating a table for a program guide service including the programming information and reference version information for a predefined virtual reference channel and generating a table in which the reference version information is updated when the programming information is changed However, Wherein the table includes broadcast version information corresponding to each broadcast channel in a predetermined time interval and reference version information corresponding to the virtual reference channel in the time interval, Wherein the virtual reference channel is a channel representing a change in the program information of each broadcast channel included in the time interval and the reference version information is updated when at least one of the program information of each broadcast channel is changed in the time interval And, Wherein the broadcast receiving terminal determines whether to update a previously received table using the reference version information.

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