JP2008187353A - Digital broadcast receiver, digital broadcast receiving method, and digital broadcast receiving program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quicken presentation of a program to a user by shortening a time required for extracting program specification information after channel switching in a channel preset type digital broadcasting receiver for making a user select a channel. <P>SOLUTION: This digital broadcast receiver is provided with: a means for storing program video/voice data and first specification information to uniquely determine a program by associating them with each other; a means for extracting second specification information to uniquely determine the program from an electronic program table; and a means for comparing the first specification information with the second specification information. When the comparison result is matched, it is decided that the program video/voice data are data under broadcasting at present, and when the comparison result is not matched, it is decided that the program video/voice data are not data under broadcasting at present. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus, a digital broadcast receiving method, and a digital broadcast receiving program. More specifically, the present invention relates to a digital broadcast receiving apparatus, a digital broadcast receiving method, and a digital broadcast receiving method that provide more comfortable operability when switching a digital broadcast reception channel. The present invention relates to a digital broadcast receiving program.

  A digital broadcast receiving apparatus that receives terrestrial digital broadcasts uses an antenna to transmit a broadcast wave from a master station that transmits a broadcast signal transmitted by a broadcast station at a predetermined frequency or a relay station that amplifies and retransmits a received radio wave from the master station. Receive. The digital broadcast receiver then demodulates / demultiplexes / decodes the received broadcast wave and presents the program transmitted by the broadcast station to the user. Therefore, a user must designate a frequency (hereinafter referred to as a channel) assigned to a broadcasting station in order to view a desired program. Therefore, in general, in order to simplify the operation for the user, a list of receivable channels (hereinafter referred to as a channel list) is stored in advance in a nonvolatile memory, and one channel is selected from the channel list. Thus, a desired broadcast station can be received.

  By the way, in digital terrestrial broadcasting, all video / audio data is sent in the MPEG2-TS format. In the MPEG2-TS format, video / audio and data broadcasts are divided into packets called TS packets. A plurality of these TS packets are collected to form a transport stream (hereinafter referred to as TS). This TS is transmitted from a broadcast station as a broadcast wave. Each TS packet is assigned a number called a PID (packet ID) so that the type of each TS packet (PAT, PMT, ES, etc. described later) can be identified. The encoded video / audio data (hereinafter referred to as ES: elementary stream) constituting a certain program is assigned with the same PID. Since the TS can transmit a maximum of three programs at the same time, program specifying information representing the relationship between the programs included in the TS and the ESs constituting the programs is defined. This program specifying information is called PAT (Program Association Table) or PMT (Program Map Table) (for example, Non-Patent Document 1). FIG. 6 is a diagram schematically showing the relationship between PAT, PMT, and ES. The PAT 110 that is program list information includes a plurality of pieces of PMT information in the currently broadcast channel. The PAT 110 includes program identification information 120 corresponding to each program. The program number 121 and the PID of each PMT are associated in advance so as to be unique. Program identification information 120 having a program number 121 of 0 is associated with a PMT having a PID of 0 (hereinafter referred to as PMT0). Each PMT includes the PID of the ES that configures each program. That is, in order to acquire a specific ES, it is necessary to acquire a PMT first.

  For example, when the program with the smallest program number (program number 0 in FIG. 6) is selected as the viewing program, the digital broadcast receiving apparatus is set to extract the PMT (PMT0 in FIG. 6) corresponding to the program number from the TS. To start extraction of the PMT. The digital broadcast receiving apparatus determines whether or not the PMT has been extracted. When the extraction of the PMT is completed, the digital broadcast receiving apparatus acquires the PID of the ES included in the PMT. Then, the digital broadcast receiving apparatus performs extraction setting of TS packets having the PID of the ES. This completes the channel selection operation.

  The program specifying information includes an EIT (Event Information Table), an event ID included in the EIT and an identification number unique to the program (for example, Non-Patent Document 2).

“Revised Digital Broadcast Textbook (above)”, Impress, Inc., October 11, 2004, pages 92-101 “Volume 4 Digital Terrestrial Television Broadcasting Broadcasting Operation Regulations”, Digital Terrestrial Television Broadcasting Operational Regulations Technical Documents Volume 2, 2.1, The Japan Radio Industry Association, September 2004, p. 4-24-27 JP 2003-110594 A

  However, when the digital broadcast receiving apparatus as described above selects and receives a predetermined channel, there are the following problems. First, in the digital terrestrial broadcasting, program specific information (PAT and PMT) that can be received on a certain channel includes only information on the currently selected channel. Therefore, when switching to another channel, it is necessary to newly extract program specifying information of the switching destination channel from the TS. On the other hand, since the program identification information is transmitted at a constant cycle, it takes a maximum of a period time to extract. Therefore, depending on the timing of channel switching, there may be a noticeable delay from channel switching to program presentation.

  As described above, program specifying information such as PAT and PMT is retransmitted at a predetermined cycle time. Therefore, for example, when the channel switching is completed at a certain time, and immediately after the PAT transmission is completed, in order to extract the PMT and present the program, it is necessary to wait until the next PAT transmission time. Even if PAT is extracted at the next time, PMT0 needs to be extracted in order to view the program number 0. Therefore, it waits until the time when PMT0 is further transmitted. That is, there is a problem that even if the channel is switched, nothing is displayed on the screen for a certain time.

  In order to avoid the above problems, it is also conceivable to store the program specifying information for each channel in a nonvolatile memory and shorten the time until channel selection is completed using the past program specifying information immediately after channel switching. However, the program specifying information that has been transmitted in a channel in the past is not always valid information at present. Specifically, even if a program has been received on a channel in the past, it will take time to return to the channel that was being watched again after switching the channel such as zapping. When it comes, another different program may be broadcast. At this time, the information already held in the nonvolatile memory is not valid. As a result, there is a problem that channel switching is not performed normally.

  For example, PMT data acquired in a selected channel, which has been conventionally performed in Japanese Patent Laid-Open No. 2003-110854, is stored in a PMT dedicated memory buffer, changed to another channel by an operation with a remote controller, etc., and then viewed again. When viewing and moving to the original selected channel, if another program is started from the program that was originally viewed because the time has passed, it is stored in the PMT dedicated memory buffer. In order to extract the ES by analyzing the PMT after detecting the PMT which is the information for specifying the program currently broadcast again after it becomes clear, the corresponding program cannot be extracted from the existing PMT data. It took longer than extracting PMT from the beginning.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to shorten the time required to extract program specific information after channel switching and speed up program presentation to the user in a channel preset type digital broadcast receiving apparatus that allows the user to select a channel. It is to provide a receiving apparatus, a receiving method, and a receiving program.

In order to achieve the above object, the present invention employs the following configuration.

  A first aspect of the present invention is a digital broadcast receiving apparatus for receiving a multiplexed signal for multiplexing and transmitting a plurality of programs through one transmission channel, wherein information specifying program video / audio data and a program are uniquely determined. Means for associating and storing the first specific information, means for extracting second specific information for uniquely determining a program from the electronic program guide, the first specific information, and the second specific information, The program video / audio data is determined to be currently broadcast data if the comparison results match, and if not, the program video / audio data is determined not to be currently broadcast data. It is a digital broadcast receiving apparatus.

  A second invention is a digital broadcast receiving apparatus for receiving a multiplexed signal for multiplexing and transmitting a plurality of programs through one transmission channel, detecting time information at which the program switches from the electronic program guide for each channel, A first unit for uniquely determining a program at a predetermined timing for the standby tuner detected by the detection unit; and a unit for storing the channel in association with the channel and a detection unit for detecting a standby tuner. A digital broadcast receiving apparatus comprising means for assigning a program for acquiring program specific information including specific information to a tuner.

  According to a third invention, in the second invention, means for detecting that the tuner has acquired program specifying information including first specifying information for uniquely determining a program, stored them in association with each other, and the detection A digital broadcast receiving apparatus comprising means for switching a standby tuner to another channel later.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, there is provided a tuner for acquiring program specific information including first specific information for uniquely determining a standby channel when there is an external tuner operation input. The digital broadcast receiving apparatus is characterized in that the process of allocation is interrupted.

  A fifth invention is characterized in that, in the second invention, the timing at which the tuner acquires the program specifying information including the first specifying information for uniquely determining the program is in the vicinity after the program start time has elapsed. It is a digital broadcast receiving apparatus.

  According to a sixth aspect of the present invention, there is provided the digital broadcast receiving apparatus according to the second aspect, wherein the standby tuner is detected in the vicinity of the program start time.

  According to a seventh aspect of the present invention, a plurality of digital broadcast receiving apparatuses connected to a network have network interface means for connecting to the network, and the number of built-in tuners has the same number of tuners as the number of all broadcast channels. The digital broadcast receiving apparatus has at least one digital broadcast receiving apparatus, and the digital broadcast receiving apparatus acquires and associates the first specific information of all channels provided by broadcasting and specific information for uniquely determining a program. And storing means for transmitting the stored information to another digital broadcast receiving apparatus connected to the network at a predetermined timing.

  According to an eighth aspect of the present invention, a plurality of digital broadcast receivers connected to a network have network interface means for connecting to the network, and any number of tuners incorporated in the plurality of broadcast receivers connected to the network. However, when less than the total number of tuners to be broadcast, there is means for sharing all broadcast channels with a tuner built in the broadcast receiving apparatus and receiving program identification information for each channel. Receiving the program identification information of the total number of channels broadcast from each digital broadcast receiving apparatus, and receiving the received program identification information of all the channels at a predetermined timing to other digital broadcasts connected to the network. A digital broadcast receiving system comprising means for transmitting to a device.

  A ninth invention is a digital broadcast receiving method for receiving a multiplexed signal for multiplexing and transmitting a plurality of programs through one transmission channel, wherein the program video / audio data and the program are uniquely determined. Storing the specific information in association with each other, extracting the second specific information for uniquely determining the program from the electronic program guide, and comparing the first specific information with the second specific information And determining that the program video / audio data is currently broadcast data if the comparison result matches, and determining that the data is not currently broadcast data if different. is there.

  A tenth aspect of the invention is a program that is executed by a computer of a digital broadcast receiving apparatus that receives a multiplexed signal for multiplexing and transmitting a plurality of programs through one transmission channel. The program video / audio data and the program are uniquely identified. Storing the first specific information determined in association with each other, extracting the second specific information for uniquely determining the program from the electronic program guide, the first specific information, and the second specific information The program video / audio data is determined to be currently broadcast data if the comparison results match, and if not, the program video / audio data is determined not to be currently broadcast data. It is a digital broadcast receiving program.

  As described above, according to the present invention, it is possible to provide a digital broadcast receiving device, a digital broadcast receiving method, a digital broadcast receiving system, and a digital broadcast receiving program that can further reduce the time required for program presentation after channel switching. it can.

  FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to the first embodiment of the present invention. In FIG. 1, a receiving antenna 1 receives a broadcast wave transmitted from an terrestrial digital broadcast station using an OFDM (Orthogonal Frequency Division Multiplex) method, and outputs it to a tuner unit 2. The tuner unit 2 selects a predetermined broadcast station by tuning to a predetermined frequency assigned to each broadcast station, and outputs broadcast radio waves received via the reception antenna 1 to the demodulation unit 3. The demodulator 3 demodulates the received broadcast radio wave into a transport stream (hereinafter referred to as TS). The demultiplexing unit 4 separates a video elementary stream (hereinafter referred to as video ES) that is compressed video data and an audio elementary stream (hereinafter referred to as audio ES) that is compressed audio data from the demodulated TS, and a decoding unit 5. Output to. Further, the demultiplexing unit 4 separates the program identification information from the TS and outputs it to the control unit 10. The decoding unit 5 decodes the video ES and audio ES into original video data and original audio data. The decoded original video data and original audio data are presented to the user at the output unit 6. Specifically, video is displayed on a display or the like, and audio is output from a speaker or the like. The control unit 10 acquires a channel number from the input unit 9 such as a remote controller and sets it in the tuner unit 2. Further, the control unit 10 analyzes the program specifying information output from the demultiplexing unit 4 and performs the extraction setting of each ES performed by the demultiplexing unit 4. Further, the program guide management unit 7 stores the electronic program guide provided from the broadcasting station for each channel received from the receiving antenna 1 by the tuner unit 2 at a predetermined timing in the program guide storage unit 8. The time information at which the program is updated for each channel may be extracted from the electronic program guide having the data structure of FIG. 7 and stored in the program guide storage unit 8. The program specific information is analyzed by the program information management unit 12, and related information is associated and stored in the program information storage unit 13. Further, the control unit 10 compares the program identification information extracted from the program guide storage unit 8 with the program identification information extracted from the program identification information storage unit 13, and if they match, the demultiplexing unit 4 starts from the matched program identification information. The corresponding video ES and audio ES are designated, decoded by the demodulator 5, and the video and audio of the program are displayed on the output unit 6.

  Next, the program specific information acquisition control by the tuner in FIG. 2 will be described. First, a user's zapping viewing mode will be described. For example, in the period from time 80 to time 81, according to the electronic program guide, program A1 is scheduled to be broadcast on channel A, program B1 is scheduled to be broadcast on channel B, and program X1 is scheduled to be broadcast on channel X. One tuner 84 is built in the digital broadcast receiving apparatus of the present invention, and the user selects channel A around time 80, and after continuing watching for a while, performs zapping viewing. And then return to channel A for viewing.

  First, after time 80, the user sets the tuner 84 to channel A and a predetermined time elapses. During that time, the program identification information of the program A1 is acquired by the program identification information management unit 12 in FIG. It is stored in the storage unit 13. When the user views zapping and views channel A again, since the program specific information of program A1 is already stored in program specific information storage unit 13, the ES of program A1 is acquired using the program specific information. The program can be viewed.

  Next, with respect to a mode in which program specific information is acquired and stored by a tuner (called a standby tuner) in a state where the built-in tuner is not used for viewing or recording by the user while the digital broadcast receiving device is turned on. explain.

  For example, in the period from time 81 to time 82, according to the electronic program guide, program A2 is scheduled to be broadcast on channel A, program B2 on channel B, and program X2 on channel X. In the vicinity of time 81, since the user does not use the channel, the tuner built in the digital receiver is a standby tuner. Since a new program of programs A2, B2,... X2 starts from time 81, the program specifying information is updated and broadcast. At time 81, standby tuner 84 is assigned to channel A in a predetermined order (for example, from channel A to channel X), and when program specific information of the program is acquired, the channel is switched to the next channel and set in sequence for each program. Program specific information is acquired and stored in the program specific information 13 of FIG. Then, when the user selects the tuner 84 for the channel A near the time 82, the program A2 is obtained using the program specifying information of the program A2 that has been acquired and stored at the time 81 in the standby tuner state. The ES can be obtained and the program can be viewed.

  Next, a description will be given of a mode in which program specifying information is acquired and stored when a tuner is used by a user or the like at a program switching time. For example, during the period from time 82 to time 85, according to the electronic program guide, program A3 is scheduled for channel A, program B3 is scheduled for channel B, and program X3 is scheduled for channel X. In the vicinity of time 82, the tuner 84 is selected for channel A by the user, so the standby tuner control is stopped, and the channel selection operation by the user is given priority. When the tuner 84 set by the user is set to channel A and a predetermined time elapses, program specific information of the program A1 is acquired and stored in the program specific information storage unit 13 by the program specific information management unit 12 of FIG. . When the user's tuner 84 has finished viewing the channel at the end of time 83, the tuner becomes a standby tuner. Therefore, the program identification information has been acquired and stored in sequence in a predetermined order from channel B, which is the channel after channel A that has already been saved. Program specific information up to channel X is stored.

  A process for extracting the program switching time from the electronic program guide will be described. Since the broadcast start date and time is stored for each program in the program guide data structure of FIG. 7, the program start time may be extracted for each service ID.

  Next, the detailed operation of the reception process performed by the reception apparatus will be described with reference to FIG. When the program specifying information is stored in the program specifying information storage unit 13 of FIG. 1 by the digital receiver of the present invention, the stored program specifying information can be used as the program specifying information of the currently broadcast program. A flow for determining whether will be described.

  First, when a tuner is tuned to a channel by the tuner tuning operation by the user (step 1), it is confirmed whether the service ID for that channel exists in the program information storage unit 13 of FIG. 2 (step 1). 2). If the service ID exists, the current time is acquired from the system clock of the apparatus body. (Step 3) Next, the service ID of the channel and the event ID corresponding to the current time are acquired from the program guide storage unit 8 of FIG. (Step 4) Then, the event ID stored in association with the service ID is acquired from the program information storage unit 13 of FIG. (Step 5) The event IDs obtained in Step 4 and Step 5 are compared (Step 6). If they match, the video ES and the current broadcast signal from the PMT stored in association with the matched event ID are obtained. Receives an audio ES. (Steps 8 and 9) When the video / audio PID does not exist in the broadcast program because the program is extended even if the event IDs match or the special program that is not scheduled to be broadcast is broadcast, If the event IDs do not match, the service ID, PMT, and event ID, which are program identification information, are received and extracted from the current broadcast signal by the processing from step 10 to step 14, and stored in the program information storage unit 13 of FIG. To do.

  Next, referring to FIG. 4, a control method for the standby tuner will be described. A standby tuner is detected (step 22) in the vicinity of the time before the program to be broadcast is switched. If the program to be broadcast is switched, new information corresponding to the program for which the program specific information is switched is transmitted, so that the standby tuner extracts the program specific information by the channel not used by the user by the standby tuner Will be started after being set. If the tuner is set to a certain channel and placed in use by a user or program reservation, a channel other than the channel being used is assigned to the standby channel. The program specific information is acquired by the standby channel in the subroutine section (SUB) in FIG. 3 (step 24).

  In this way, the process of acquiring the program specific information for each channel in the standby tuner and storing the program specific information in the program specific information storage unit 13 in FIG. 1 is performed in the vicinity after the time when the broadcast program is switched. It repeats so that it may be updated to the corresponding program specific information (step 26). As for the channel setting for the standby tuner, if there are a plurality of standby tuners, different channels are allocated at the same time, and the same channel is not allocated until the program is switched.

  In the second embodiment, use in which a plurality of digital broadcast receiving apparatuses of the present invention are connected in a network will be described.

  When a plurality of digital broadcast receiving apparatuses of the present invention are connected to the network 70 in FIG. 5, the number of tuners built into each digital broadcast receiving apparatus varies, and any number of built-in tuners is broadcast. If the total number of channels is not reached, the program specific information of all channels broadcast by each digital broadcast receiving apparatus is acquired. For example, the broadcast channel shared by each of the digital broadcast receiving devices 51 to 54 connected to the network is notified by the digital broadcast receiving device 50. Assuming that all channels to be broadcast are from A to X, the digital broadcast receiver 50 shares A to E, the digital broadcast receiver 51 shares F to H, and the digital broadcast receiver 52 shares I. The digital broadcast receiver 53 shares J, and the digital broadcast receiver 54 shares K and L. First, in the shared digital broadcast receiving apparatus, the program specifying information of these channels is acquired, and the program specifying information from M to X, which is the remaining channels that cannot be shared, is acquired from the tuner that has been acquired. If the acquisition is completed in sequence, the digital broadcast receiving device 50 acquires M to Q, the digital broadcast receiving device 51 acquires R to T, the digital broadcast receiving device 52 acquires U, and receives the digital broadcast. The device 53 acquires V, and the digital broadcast receiving device 54 acquires W and X. After that, for example, the digital broadcast receiving device 50 collects the program specific information of the acquired channels A to X, and transmits them to the other digital broadcast receiving devices 51 to 54 at a predetermined timing to complete reception. To do. As a result, it is possible to construct a system that eliminates variations in the ability to acquire program specific information due to variations in the number of tuners incorporated in each of a plurality of digital broadcast receiving apparatuses connected to the network.

  As another embodiment, for example, among a plurality of digital broadcast receivers connected to the network 70, the same number of digital broadcast receivers as the number of tuners in which the number of built-in tuners is broadcast are arranged, and all channels broadcasted Is acquired in the vicinity of the program start time, and then transmitted to another digital broadcast receiving apparatus connected to the network at a predetermined timing. As a result, other digital broadcast receivers do not need to acquire program identification information with a built-in tuner, and by receiving program identification information for all channels, the number of built-in tuners is the same as the number of all channels to be broadcast. Similar to a digital broadcast receiver, a system that can reduce the time required to present a program after switching channels, and eliminates variations in the ability to acquire program-specific information due to variations in the number of built-in tuners, regardless of which channel is received It is possible to build

1 is a block diagram mainly showing a digital broadcast receiving apparatus according to a first embodiment of the present invention. The figure which shows the operation | movement of the reception process which concerns on the 1st Embodiment of this invention. The flowchart which shows the operation | movement of the reception process which concerns on the 1st Embodiment of this invention. The flowchart which shows the operation | movement of the reception process which concerns on the 1st Embodiment of this invention. The block diagram which shows the form which uses the digital broadcast receiver which concerns on the 2nd Embodiment of this invention in a network Diagram showing the relationship between PAT, PMT and ES Digital broadcast electronic program guide data structure

Explanation of symbols

1 receiving antenna 2, 60, 61, 62, 63, 64 tuner unit 3 demodulating unit 4 demultiplexing unit 5 decoding unit 6 output unit 7 program table management unit 8 program table storage unit 9 input unit 10 control unit 11 transmission / reception unit 12 program Specific information management unit 13 Program specific information storage unit 50, 51, 52, 53, 54, 100, 101, 102 Digital broadcast receiver 70 Network

Claims (10)

A digital broadcast receiving apparatus that receives a multiplexed signal for multiplexing and transmitting a plurality of programs on one transmission channel,
Means for associating and storing information for designating program video / audio data and first specific information for uniquely determining a program;
Means for extracting second specific information for uniquely determining a program from the electronic program guide;
Means for comparing the first specific information with the second specific information;
If the comparison results match
The program video / audio data is determined as data currently being broadcast.
If it is different, it is determined that the data is not currently being broadcast. A digital broadcast receiving apparatus that receives a multiplexed signal for multiplexing and transmitting a plurality of programs on one transmission channel,
Detecting time information at which a program is switched from the electronic program guide for each channel, storing means associated with the channel, and detecting means for detecting a standby tuner;
The standby tuner detected by the detecting means is at a predetermined timing.
A digital broadcast receiving apparatus comprising means for assigning to a tuner for acquiring program specifying information including first specifying information for uniquely determining a program In claim 2,
Means for detecting that the tuner has acquired program specifying information including first specifying information for uniquely determining a program, stored them in association with each other, and
A digital broadcast receiving apparatus comprising means for switching a standby tuner to another channel after the detection In claim 2, if there is an external tuner operation input,
A digital broadcast receiving apparatus characterized by interrupting a process of assigning a standby channel to a tuner for acquiring program specific information including first specific information for uniquely determining a program The timing at which the tuner acquires program specifying information including first specifying information for uniquely determining a program according to claim 2,
A digital broadcast receiver characterized by being in the vicinity of a program start time 3. The digital broadcast receiving apparatus according to claim 2, wherein the timing of detecting the standby tuner is in the vicinity of a program start time. In a plurality of digital broadcast receivers connected to a network,
Network interface means for connecting to the network;
Having at least one or more of the above digital broadcast receivers having the same number of tuners as the number of all broadcast channels,
The digital broadcast receiving apparatus obtains, associates and stores the first specific information of all channels provided by broadcasting and specific information for uniquely determining a program;
A digital broadcast receiving system comprising means for transmitting the stored information at a predetermined timing to another digital broadcast receiving apparatus connected to the network. In a plurality of digital broadcast receivers connected to a network,
Network interface means for connecting to the network;
When none of the tuners built in a plurality of broadcast receivers connected to the network is less than the total number of tuners broadcasted, all the broadcast channels are shared by the tuners built in the broadcast receivers. Means for receiving program specific information for each channel,
Receiving the program identification information of the total number of channels broadcast from each digital broadcast receiving device received in a shared manner,
A digital broadcast receiving system comprising means for transmitting the received program specifying information of all the channels to another digital broadcast receiving apparatus connected to the network at a predetermined timing. A digital broadcast receiving method for receiving a multiplexed signal for multiplexing and transmitting a plurality of programs on one transmission channel,
Associating and storing program video / audio data and first specific information for uniquely determining a program;
A step of extracting second specific information for uniquely determining a program from an electronic program guide and a step of comparing the first specific information with the second specific information; and if the comparison result matches, A digital broadcast receiving method characterized in that if the program video / audio data is determined to be different from the data currently being broadcast, the data is not currently being broadcast. A program to be executed by a computer of a digital broadcast receiving apparatus that receives a multiplexed signal for multiplexing and transmitting a plurality of programs through one transmission channel,
Associating and storing program video / audio data and first specific information for uniquely determining a program;
A step of extracting second specific information for uniquely determining a program from an electronic program guide and a step of comparing the first specific information with the second specific information; and if the comparison result matches, Digital broadcast receiving program characterized in that if program video / audio data is determined to be different from currently broadcast data, it is determined that the data is not currently broadcast

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