JP2011061575A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To tune to any other service from a service without inputting any PIN code or the like even if a child lock is applied. <P>SOLUTION: The present invention relates to a broadcast receiver wherein a built-in application including a child-lock application and an MHP application are concurrently operable. The broadcast receiver includes: a built-in application management section and an MHP application management section for performing activation and key delivery control; a data management section for managing PIN information for child-lock cancellation and parental information data for child-lock activation; a tuner section for tuning to a target service based on a service tuning request from an application; a key delivery mode management section for managing a current operation mode between a mode 1 for operating only the built-in application and a mode 2 for operating the MHP application; and a key delivery section for delivering an input key code from a remote controller. In the case that the key code from the remote controller relates to tuning due to the MHP application, the key delivery section delivers the key code to the MHP application management section. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a digital broadcast receiver. In particular, the present invention relates to a digital broadcast receiver that complies with the MHP standard and can operate a built-in application and an MHP application downloaded from a broadcasting station.

  Conventionally, the MHP standard is known as a standard related to digital broadcasting (see, for example, Non-Patent Document 1).

  In addition, there is a technique for performing key distribution control in each application using a remote controller mode switching as a trigger in a digital broadcast receiver in which a TV application and a download application operate (see, for example, Patent Document 1).

JP 2008-310553 A

MHP standard (DVB-MHP Specification 1.1.3) (http://www.mhp.org/specs/a068r3_mhp11.zip)

  However, in the above conventional technique, key distribution is performed after the TV application mode and the download application mode are completely switched. For this reason, when the download application and the TV application are operating at the same time, for example, when the child lock application occupies all the key codes, there is a problem that the key cannot be delivered to other download applications. It was.

  An object of the present invention is to provide a digital broadcast receiver capable of selecting another service from the service without inputting a PIN code or the like in channel selection by an MHP application even when child lock is applied. is there.

A digital broadcast receiver according to the present invention is a digital broadcast receiver capable of simultaneously operating a built-in application including a child lock application and an MHP application downloaded from a broadcast station,
An MHP application holding unit that manages the MHP application downloaded from a broadcasting station;
A built-in application management unit for starting the built-in application and controlling key distribution;
An MHP application management unit for starting the MHP application and performing key distribution control;
A data management unit for managing PIN information for releasing child lock by the child lock application and parental information data for activating child lock by the child lock application;
A channel selection unit that selects a target service based on a service channel selection request from the built-in application management unit and the MHP application management unit;
Of the mode 1 in which only the built-in application operates and the mode 2 in which the MHP application operates, a key distribution mode management unit that manages a key distribution mode corresponding to the current operation mode;
A key delivery unit for delivering a key code input from a remote controller to the built-in application management unit or the MHP application management unit;
With
The key delivery unit delivers the key code from the remote control to the MHP application management unit when the key code from the remote control is a key code related to channel selection by the MHP application.

  The key distribution mode management unit may manage a child lock flag regarding whether or not the currently selected service is child locked.

  Further, the key delivery unit refers to the key delivery mode managed by the key delivery mode management unit. When the mode is the mode 2 in which the MHP application operates, the key delivery unit further sets a child lock flag managed by the key delivery mode management unit. If the child lock flag is “ON”, the key code from the remote controller is analyzed. If the child lock flag is a key code related to channel selection by the MHP application, the key code from the remote controller is You may deliver to the said MHP application management part.

  Still further, the key distribution unit refers to the key distribution mode managed by the key distribution mode management unit, and in the mode 2 in which the MHP application operates, analyzes the key code from the remote controller and analyzes the MHP application. May be delivered to the MHP application management unit.

  In the digital broadcast receiver according to the present invention, even when child lock is activated by the built-in application, the key distribution mode and the child lock flag are referred to, the input key code is analyzed, and channel selection by the MHP application is performed. If it is a key code, the key code can be delivered to the MHP application. As a result, when it is not necessary to watch a service with child lock, the key code for channel selection by the MHP application can be delivered to the MHP application without entering the PIN code. You can tune in.

2 is a block diagram showing a hardware configuration of digital broadcast receiver 100 according to Embodiment 1. FIG. It is the schematic which shows an example of the key of the remote control 300. FIG. 3 is a schematic diagram showing a software hierarchical structure of digital broadcast receiver 100 according to Embodiment 1. FIG. It is the schematic explaining channel selection by a built-in application, and channel selection by a MHP application about a digital broadcast service. (A), (b), (c) is the schematic which shows the example in the case of performing the channel selection of the service by the MHP application in the digital broadcast receiver which concerns on Embodiment 1 in order. (A), (b), (c) is the schematic which shows the state at the time of performing the channel selection of the service by the MHP application in the conventional digital broadcast receiver, when the child lock is performed by the built-in application (D) is a schematic view showing the service 3 when the child lock is released by inputting the PIN code. It is a flowchart of a channel selection operation in a normal built-in application. It is a flowchart of the starting process of a MHP application. It is a flowchart of a channel selection operation in the MHP application. It is a flowchart of a process when the child lock by a built-in application is applied at the time of channel selection. It is a flowchart of the channel selection operation | movement by an MHP application in case the child lock application which is a built-in application is starting.

  A digital broadcast receiver according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, substantially the same members are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a block diagram showing a hardware configuration of digital broadcast receiver 100 according to the first embodiment. The digital broadcast receiver 100 includes a tuner 101, a TD decoder 102, a CPU 103, a memory 104, an AV decoder 105, a JAVA execution unit 106, a synthesis circuit 107, a video / audio output circuit 108, a remote control reception unit 109, and a remote control 300.

  In the digital broadcast receiver 100, built-in applications (TV applications) 201a and 201b and MHP applications 202a and 202b downloaded from a broadcasting station operate. The digital broadcast receiver 100 manages one of the operation modes (key distribution mode) of mode 1 in which only the built-in applications 201a and 201b operate and mode 2 in which the MHP applications 202a and 202b operate. The built-in applications 201a and 201b include a child lock application, and child lock is applied based on parental information regarding a service to be selected. The digital broadcast receiver 100 manages a child lock flag regarding whether or not a child lock is applied to a currently selected service. For a service with child lock, the child lock can be released by entering a PIN code and the service can be viewed. In the digital broadcast receiver 100, the key code received from the remote controller 300 can be shared between the built-in applications 201a and 201b and the MHP applications 202a and 202b. For example, even when child lock is activated on the built-in applications 201a and 201b, if the key code is for tuning by the MHP applications 202a and 202b, the key entered without entering the PIN code The code is delivered to the MHP application. That is, in this digital broadcast receiver 100, even when child lock is activated by the built-in application, the key distribution mode and the child lock flag are referred to, the input key code is analyzed, and channel selection by the MHP application is performed. If it is a key code, the key code is delivered to the MHP application. As a result, when it is not necessary to view the service with child lock, the key code for channel selection by the MHP application can be delivered to the MHP application without entering the PIN code, and the next service can be selected. Can bureau.

Below, each structural member in the hardware of the digital broadcast receiver 100 which concerns on this invention is demonstrated.
<Tuner 101>
The tuner 101 receives, demodulates and outputs a TS (Transport Steam) in the MPEG2 (Motion Picture Experts Group phase 2) format in which the selected service is distributed. The TS includes one or more MHP applications as components in addition to video data and audio data. Here, the MHP applications 202a and 202b are composed of a plurality of class files and a plurality of data files, and are transmitted as object carousels.

<TD decoder 102>
The TD decoder 102 filters TS input from the tuner. Then, the video data and the audio data are output to the AV decoder 105, and the AIT and the object carousel are output to the CPU.

<CPU 103>
The CPU 103 is a controller that controls the entire digital broadcast receiver 100. The tuner 101 is tuned to a predetermined service according to the key code input from the remote control 300 via the remote control receiving unit 109. In addition, the life cycle of the MHP application is managed based on the AIT, and the corresponding object carousel is cached in the memory 104. Then, an instruction to execute the MHP application is issued to the JAVA execution unit 106.

<Memory 104>
The memory 104 is a storage unit such as an HDD, a volatile memory, or a nonvolatile memory. The memory 104 caches an object carousel related to the MHP application in a state where it can be referred to as a file system. Then, a file is provided in response to a file reading instruction from the JAVA execution unit 106. The memory 104 holds information such as a key distribution mode and setting information such as PIN information.

<AV decoder 105>
The AV decoder 105 decodes the video data and audio data input from the TD decoder 102 and outputs them.

<JAVA execution unit 106>
The JAVA execution unit 106 is a JAVA virtual machine in DVB-MHP. In response to the MHP application execution instruction from the CPU 103, the configuration file of the instructed MHP application is read from the memory 104 and executed.
<Synthesizing circuit 107>
The synthesizing circuit 107 synthesizes and outputs the video data input from the AV decoder 105 and the video data input from the JAVA execution unit 106.
<Video / Audio Output Circuit 108>
The video / audio output circuit 108 outputs the video data input from the synthesis circuit 107 to a display device such as a monitor, and outputs the audio data to an audio output device (not shown) such as a speaker.
<Remote control receiver 109>
The remote control receiving unit 109 receives user operation information from the remote control 300 and outputs it to the CPU 103 as a key code.

  FIG. 2 is a schematic diagram illustrating an example of keys on the remote controller 300. In this remote control 300, up and down keys (↑ and ↓) 302 are assigned to keys for channel selection by a built-in application, and left and right keys (← and →) 304 are selected by an MHP application. Assigned to the key for. A numeric keypad 306 for direct channel selection is also provided. Needless to say, the key configuration of the remote controller 300 is not limited to that shown in FIG.

  FIG. 3 is a schematic diagram showing a software hierarchical structure of the digital broadcast receiver 100 according to the first embodiment. The digital broadcast receiver 100 includes, as software, a lowermost OS 210 as a base, and a data management unit 205, a channel selection unit 206, a key distribution mode management unit 207, a key distribution unit 208, an MHP, in the hierarchy above the OS 210. And an application holding unit 209. Furthermore, it has a built-in application management unit 203 in the upper layer, an MHP application management unit 204 in the upper layer, and built-in applications 201a and 201b and MHP applications 202a and 202b in the uppermost layer. Have.

Hereinafter, each level of software of the digital broadcast receiver 100 will be described.
<Built-in applications 201a and 201b>
Examples of the built-in applications 201a and 201b are applications that are installed at the time of shipment of the digital broadcast receiver 100, such as a child lock application and a banner application. Alternatively, an application installed additionally via a network or a storage medium such as an SD card may be used.
<MHP applications 202a and 202b>
The MHP applications 202a and 202b are applications acquired by downloading from a broadcasting station such as an EPG application, a game application, and a weather forecast application, for example.

<Built-in application management unit 203>
The built-in application management unit 203 performs activation of the built-in applications 201a and 201b and key distribution control. Further, it is determined whether or not AIT (Application Information Table) information exists in the service selected by the channel selection unit 206, and the MHP application management unit 204 is activated based on the AIT information. In each service, video data, audio data, AIT which is MHP application control information, and an object carousel including MHP applications 202a and 202b are multiplexed and transmitted.

  The AIT describes information necessary for application control, such as control instructions for starting and stopping an application, link information to an object carousel for delivering the application, and a file path used when starting the application. Yes.

  The built-in application management unit 203 refers to a PMT (Program Map Table) that is multiplexed and transmitted to the TS, and detects the PID (Packet ID) of the AIT. Then, an AIT TS packet is extracted from the TS, and “Application types” and “Application control code values” are referred to. When the identifier of “Application control code values” is “AUTOSTART”, the MHP application management unit 204 is Start.

<MHP application management unit 204>
The MHP application management unit 204 is middleware that executes the MHP application, and performs activation of the MHP applications 202a and 202b and key distribution control.

<Data management unit 205>
The data management unit 205 manages data such as PIN (Personal Identification Number) information for releasing the child lock by the child lock application and parental information for child lock activation by the child lock application.

<Channel selection unit 206>
The channel selection unit 206 selects a target service based on a channel selection request from the built-in application management unit 203 and the MHP application management unit 204.

<Key delivery mode management unit 207>
The key delivery mode management unit 207 manages the current operation mode. Specifically, the key distribution mode corresponding to the current operation mode is managed among “mode 1” in which only the built-in application operates and “mode 2” in which the MHP application operates. In the case of “mode 2”, it only indicates that the MHP application operates, and does not define whether the built-in application operates. Further, the key delivery mode management unit 207 manages a child lock flag indicating whether or not the child lock application which is a built-in application is activated in the state of “mode 2”.

<Key delivery unit 208>
The key delivery unit 208 delivers the key code from the remote controller 300 to the built-in application management unit 203 or the MHP application management unit 204 according to the key delivery mode managed by the key delivery mode management unit 207 and the child lock flag. Specifically, referring to the key distribution mode, when the mode is “mode 2” in which the MHP application operates, the child lock flag is further referred to. When the child lock flag is “ON”, the input key Analyze the code. When the input key code is a key code for channel selection by the MHP application, for example, a left / right key (← or →) 304, the key code 304 is key-delivered to the MHP application. As a result, when it is not necessary to view the service with child lock, the key code for channel selection by the MHP application can be delivered to the MHP application without entering the PIN code, and the next service can be selected. Can bureau.

<MHP application holding unit 209>
The MHP application holding unit 209 manages the MHP application downloaded from the broadcasting station. As for the download, even if the MHP application included in all available services is downloaded in advance, the MHP application identified by “AUTOSTART” in the AIT information is downloaded every time the channel is selected. Good.
<OS210>
The OS 210 is software that manages the entire digital broadcast receiver 100.

  FIG. 4 is a schematic diagram illustrating channel selection by a built-in application and channel selection by an MHP application for a digital broadcast service. As described above, the up and down keys (↑ and ↓) 302 in the remote controller 300 are assigned for channel selection by the built-in application, and the left and right keys (← and →) 304 are assigned for channel selection by the MHP application. Therefore, FIG. 4 also shows an image of channel selection by the built-in application in the vertical direction, and an image of channel selection by the MHP application in the horizontal direction. The digital broadcasting service does not have to be provided separately for the service selected by the built-in application and the service selected by the MHP application, and some of the services selected by the built-in application. The service may be selected by the MHP application. For example, as shown in FIG. 4, services 1, 3 and 4 which are services selected by the MHP application are included in the services selected by the built-in application. In this case, when the right key (→) is pressed from “service 1” in channel selection by the MHP application, “service 3” is selected. This “service 3” is a service that can be selected by both the built-in application and the MHP application.

  (A), (b), and (c) of FIG. 5 are schematic diagrams illustrating an example in the case of selecting a service in order by the MHP application in the digital broadcast receiver according to the first embodiment. (A), (b), and (c) of FIG. 6 show states when child lock is performed by a built-in application while selecting a service by an MHP application in a conventional digital broadcast receiver. FIG. 4D is a schematic diagram illustrating the service 3 when the child code is released by inputting the PIN code.

  As shown in FIG. 6, in the case where the channel selection of services by the MHP application is performed in order, the process proceeds from “service 1” in FIG. 6A to “service 3” in FIG. 6B. Think about the case. If this “service 3” is a service that is subject to child lock by the child lock application that is a built-in application, for example, when “service 3” is selected as shown in FIG. Child lock by built-in application. Conventionally, when child lock is applied in this way, even if it is not necessary to view “service 3” and simply want to select the next service, for example, service 4, by the MHP application, the child by the built-in application is used. It was necessary to input a “PIN code” for releasing the lock (FIG. 6D). In this case, conventionally, the key code input from the remote controller 300 is exclusively used by the built-in application, and the key is not delivered to the MHP application.

  In the digital broadcast receiver 100 according to the first embodiment, even in the above case, the input key code is not exclusively used by the built-in application, but the input key code is used by the built-in application and the MHP application. Shared by both. That is, as shown in FIG. 5C, when the next service is desired to be selected by the MHP application, the key code for channel selection by the MHP application, that is, the left / right key (← or →) is selected from the remote controller 300. If input, the channel selection by the MHP application becomes possible. Specifically, when the key delivery unit 208 refers to that the key delivery mode is “mode 2”, the key code input from the remote controller 300 is a key code for channel selection by the MHP application. Delivers the key code to the MHP application.

  FIG. 7 to FIG. 11 are flowcharts of software constituting the digital broadcast receiver 100 according to the first embodiment.

<Normal tuning operation (tuning operation with built-in application)>
FIG. 7 is a flowchart of a channel selection operation in a normal built-in application. Here, as a premise, the key distribution mode management unit 207 stores “mode 1” in which only the built-in application is operating.
(1) When the OS 210 detects the remote control code “XXXX (channel selection request)”, the OS 210 notifies the key delivery unit 208 of the remote control code “XXXX (channel selection request)” (S01).
(2) The key delivery unit 208 refers to the mode managed by the key delivery mode management unit 207. In the case of “mode 1”, the remote control code “XXXX (channel selection request)” is delivered to the built-in application management unit 203 (S02).
(3) The built-in application management unit 203 decodes the remote control code “XXXX (channel selection request)” and notifies the channel selection unit 206 of the channel selection request (S03).
(4) The channel selection unit 206 extracts an EIT (Event Information Table) corresponding to the channel selection request from the TS. The EIT includes information such as the title and broadcast time of each program. If necessary, the EIT includes a descriptor (parental_rating_descriptor) in which parental information is described. If this descriptor is included in the EIT, the received descriptor is output to the built-in application management unit 203 (S04).
(5) The built-in application management unit 203 refers to the parental information stored in the data management unit 205 and compares the parental information with the descriptor input from the channel selection unit 206. Determine whether or not is necessary. If necessary, a child lock application that is a built-in application is activated (S05).
As described above, the service is selected by the built-in application.

<MHP application startup process>
FIG. 8 is a flowchart of the activation process of the MHP application.
(6) When the built-in application management unit 203 detects that the AIT is included in the received PMT, the built-in application management unit 203 activates the MHP application management unit 204 (S06).
(7) The built-in application management unit 203 changes the mode of the key distribution mode management unit 207 to “mode 2” (S07).
(8) The MHP application management unit 204 activates the MHP application cached by the MHP application holding unit 209 based on the AIT information (S08).
Thus, the MHP application is activated.

<Channel selection operation with MHP application>
FIG. 9 is a flowchart of the channel selection operation in the MHP application. Here, it is assumed that the child lock flag is “OFF” at the time of activation.
(9) When the OS 210 detects the remote control code “(channel selection request)”, the OS 210 notifies the key distribution unit 208 of the remote control code “(channel selection request)” (S09).
(10) The key delivery unit 208 refers to the mode of the key delivery mode management unit 207. Since it is “mode 2”, the child lock flag is further confirmed (S10).
(11) Since the child lock flag is “OFF”, the key delivery unit 208 delivers the remote control code “(channel selection request)” to the MHP application management unit 204 (S11).
(12) The MHP application management unit 204 delivers the remote control code “(channel selection request)” to the corresponding MHP application, and notifies the channel selection unit 206 of the channel selection request based on an instruction from the corresponding MHP application. (S12).
(13) The channel selection unit 206 receives the PMT corresponding to the channel selection request, and notifies the received PMT to the built-in application management unit 203 and the MHP application management unit 204 (S13).
(14) The MHP application management unit 204 starts / continues / ends the MHP application cached by the MHP application holding unit 209 (S14).
As described above, the channel selection of the service by the MHP application is performed.

<Processing when child lock is applied during tuning>
FIG. 10 is a flowchart of processing when child lock is applied by a built-in application during channel selection.
(15) The built-in application management unit 203 refers to the parental information stored in the data management unit 205 and compares it with the received EIT descriptor (parental_rating_descriptor) to determine whether child lock is necessary. If necessary, a child lock application that is a built-in application is activated (S15).
(16) The built-in application management unit 203 sets the child lock flag managed by the key distribution mode management unit 207 to “ON” (S16).
As described above, child lock is applied by the child lock application which is a built-in application at the time of channel selection.

<Channel selection operation in the MHP application when the child lock application is running>
FIG. 11 is a flowchart of the channel selection operation in the MHP application when the child lock application that is a built-in application is activated in the digital broadcast receiver 100 according to the first embodiment.
(17) When the OS 210 detects the remote control code “(channel selection request)”, the OS 210 notifies the key distribution unit of the remote control code “(channel selection request)” (S17).
(18) The key delivery unit 208 refers to the mode of the key delivery mode management unit 207. In this case, since it is “mode 2”, the child lock flag is further confirmed (S18).
(19) In this case, since the child lock flag is “ON”, the key delivery unit 208 analyzes the remote control code (S19).
(20) When the remote control code is “← →” (left / right key) related to channel selection of the MHP application, the key delivery unit 208 delivers the remote control code to the MHP application management unit 204 (S20).
(21) The MHP application management unit 204 delivers the remote control code to the corresponding MHP application, and notifies the channel selection unit 206 of a channel selection request based on an instruction from the corresponding MHP application (S21).
(22) The channel selection unit 206 receives the PMT corresponding to the channel selection request, and notifies the received PMT to the built-in application management unit 203 and the MHP application management unit 204 (S22).
(23) The built-in application management unit 203 refers to the parental information stored in the data management unit 205 and compares it with the received EIT descriptor (parental_rating_descriptor) to determine whether child lock is necessary. . If it is determined that child lock is necessary, the child lock application is continued, if not necessary, the child lock application is terminated, and the child lock flag managed by the key distribution mode management unit 207 is turned “OFF” (S23). .
(24) The MHP application management unit 204 starts / continues / ends the MHP application cached by the MHP application holding unit 209 (S24).
As described above, even when the child lock application is activated, it is possible to select a service in the MHP application without inputting the PIN code.

A process when the input key code is other than the key code related to channel selection of the MHP application is shown below.
(25) The key delivery unit 208 delivers the remote control code to the built-in application management unit 203 regardless of the mode when the remote control code is a key code related to channel selection of the MHP application, for example, “← →” (left / right key). (S25).
(26) The built-in application management unit 203 delivers the remote control code to the child lock application (S26).
(27) After confirming the PIN input from the user, the child lock application is terminated. If the input PIN is not correct, the child lock is not released (S27).
(28) The built-in application management unit 203 detects the end of the child lock application, and sets the child lock flag managed by the key distribution mode management unit 207 to “OFF” (S28).
In this way, the child lock is released.

  In the digital broadcast receiver according to the present invention, a built-in application (TV application) and an MHP application downloaded from a broadcasting station operate. In addition, it is possible to select a service by another MHP application without inputting a PIN code from the service to which the child lock is applied.

100 Digital Broadcasting Receiver 101 Tuner 102 TD Decoder 103 CPU
104 Memory 105 AV Decoder 106 JAVA Execution Unit 107 Synthesis Circuit 108 Video / Audio Output Circuit 109 Remote Control Reception Unit 201a, 201b Built-in Application 202a, 202b MHP Application 203 Built-in Application Management Unit 204 MHP Application Management Unit 205 Data Management Unit 206 Channel Selection Unit 207 Key delivery mode management unit 208 Key delivery unit 209 MHP application holding unit 210 OS
300 Remote control 302 Up / down keys (↑ and ↓)
304 Left and right keys (← and →)
306 numeric keypad

Claims (4)

A digital broadcast receiver capable of simultaneously operating a built-in application including a child lock application and an MHP application downloaded from a broadcasting station,
An MHP application holding unit that manages the MHP application downloaded from a broadcasting station;
A built-in application management unit for starting the built-in application and controlling key distribution;
An MHP application management unit for starting the MHP application and performing key distribution control;
A data management unit for managing PIN information for releasing child lock by the child lock application and parental information data for activating child lock by the child lock application;
A channel selection unit that selects a target service based on a service channel selection request from the built-in application management unit and the MHP application management unit;
Of the mode 1 in which only the built-in application operates and the mode 2 in which the MHP application operates, a key distribution mode management unit that manages a key distribution mode corresponding to the current operation mode;
A key delivery unit for delivering a key code input from a remote controller to the built-in application management unit or the MHP application management unit;
With
The key delivery unit delivers the key code from the remote controller to the MHP application management unit when the key code from the remote controller is a key code related to channel selection by the MHP application. Broadcast receiver.   The digital broadcast receiver according to claim 1, wherein the key distribution mode management unit manages a child lock flag regarding whether or not a child lock is applied to a currently selected service.   The key distribution unit refers to a key distribution mode managed by the key distribution mode management unit, and further refers to a child lock flag managed by the key distribution mode management unit in the case of mode 2 in which an MHP application operates. When the child lock flag is “ON”, the key code from the remote controller is analyzed. When the child lock flag is a key code related to channel selection by the MHP application, the key code from the remote controller is changed to the MHP. The digital broadcast receiver according to claim 2, which is delivered to an application management unit.   The key distribution unit refers to the key distribution mode managed by the key distribution mode management unit, and in the mode 2 in which the MHP application operates, analyzes the key code from the remote controller and selects the channel by the MHP application. The digital broadcast receiver according to claim 1, wherein the key code from the remote controller is delivered to the MHP application management unit.

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