JP5595859B2 - Video playback apparatus and data management method thereof - Google Patents

Description

  The present invention relates to a video playback apparatus that plays back video content recorded on a recording medium and a data management method thereof.

  In recent years, Blu-ray Disc (registered trademark) has been used as a recording medium for recording high-definition video data. There are two types of applications recorded on Blu-ray Discs: HDMV titles and BD-J titles. A title is a playback unit of disc content. The HDMV title is an extension of the conventional DVD (Digital Versatile Disc) standard, and the BD-J title is composed of a Java (registered trademark) program. With a BD-J title, a content provider can freely create content.

  When a playback device that plays back a Blu-ray Disc is instructed to play a disc, it plays a stream file such as video or audio related to the title. In addition, this type of video playback device can also acquire data from the outside by connecting to the Internet.

  In Patent Document 1, content is downloaded through a network and recorded on a disc based on a URL (Uniform Resource Locator) given from a Java application in a BD-J mode (a mode for reproducing a BD-J title). It is described that playback is performed in the same manner.

  Regarding management of acquired data, Patent Literature 2 includes a file when an instruction to delete a specific file is received from a data file downloaded from a content provider and stored in a local storage. It is described that only the files related to the titles to be deleted or only the files that are desired to be deleted are deleted.

International Publication No. 2005/045840 Special table 2008-522342 gazette

  As described above, in a video playback device that plays back a Blu-ray Disc, data can be acquired from the outside by using the BD-J mode, and the acquired data is stored in a local storage. In this case, there are a case where the user gives an instruction to download the content and a case where the Java application automatically downloads the content in the course of its operation.

  An example of data downloaded from the outside is a movie trailer. Generally, the amount of data of movie trailers is large, and there are some that can be several hundred MB (Megabyte). On the other hand, a flash memory is mainly used for the local storage of the disk playback device, and its capacity is about 1 GB (Gigabyte) to several GB. For this reason, if a plurality of large-capacity data is stored, such as a movie trailer, the capacity of the local storage becomes insufficient, and no more data can be stored.

  Normally, unnecessary data is selected and deleted from data stored in the local storage by the user. However, the operation of selecting and erasing unnecessary data is not only troublesome for the user, but it is necessary to always pay attention to the free space of the local storage, which reduces convenience. Further, the flash memory has a short lifetime if data is frequently written and erased.

  The present invention has been made in view of the problems of the prior art, and is a video playback device that plays back video content recorded on a recording medium, and that can suppress writing of downloaded data to a local storage. And a data management method thereof.

According to an aspect of the present invention, a recording medium on which video content is recorded can be freely attached and detached, and a recording information reading unit that reads data from the recording medium when the recording medium is attached; and the recording information A content reproduction unit that processes the signal output from the reading unit and reproduces the video content; a communication unit that communicates with an external server; a control unit that controls the content reproduction unit and the communication unit; An operation unit for transmitting user operations to the control unit; a volatile memory connected to the control unit and capable of writing and reading data; and a non-volatile memory connected to the control unit and capable of writing and reading data And the control unit acquires related information related to the video content recorded on the recording medium from the external server via the communication unit, It is associated information it is determined whether or not due to a user instruction input via the operation unit, the relevant information when it is determined to be due to a user instruction input via the operation unit Additional information indicating that it is to be copied is added and recorded in the volatile memory, and only the related information to which the additional information is added is copied to the nonvolatile memory among the related information recorded in the volatile memory. There is provided a video reproduction apparatus characterized by the above.

According to another aspect of the present invention, a recording medium on which video content is recorded can be attached and detached, and when the recording medium is attached, the video content recorded on the recording medium is played back. In the data management method of the video reproducing apparatus, the step of acquiring related information related to the video content recorded on the recording medium from an external server, and the user instruction that the acquisition of the related information is input via the operation unit A step of adding additional information indicating that the information is to be copied to the related information when it is determined that it is based on a user instruction input via the operation unit; and And recording only the related information to which the additional information is added among the related information recorded in the volatile memory. Data management method characterized by a step of copying is provided.

According to the present invention, it is determined whether or not the related information acquired through the communication unit is based on a user instruction (an instruction input through the operation unit). Additional information indicating that is added. Then, the non-volatile memory, and records only the relevant information which the additional information has been added. This suppresses unnecessary information from being recorded in the nonvolatile memory. As a result, the convenience of the user is improved and the lifetime of the nonvolatile memory is extended.

FIG. 1 is a block diagram of a video reproduction apparatus according to the first embodiment. FIG. 2 is a diagram showing a directory structure of various contents recorded on the Blu-ray Disc. FIG. 3 is a diagram for explaining a configuration example and an operation example of content recorded on a disc. FIG. 4 is a diagram showing an example of a movie trailer title list. FIG. 5 is a flowchart showing a data management method of the video reproduction apparatus according to the first embodiment. FIG. 6 is a diagram showing a screen display example when inquiring of the user whether or not to save the downloaded video in the local storage. FIG. 7 is a flowchart showing a data management method according to the second embodiment. FIG. 8 is a block diagram of a video playback apparatus according to the third embodiment. FIG. 9 is a diagram illustrating a screen display example when inquiring of the user whether to play back or discard the downloaded content.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a block diagram of a video playback apparatus according to the first embodiment of the present invention.

  The video reproduction apparatus 100 according to the present embodiment includes a recording information reading device (drive unit) 2 that reads data from the disc 1, an operation unit 3, an output information generation unit 4, a communication unit 19, and a local storage 20. Has been. In the present embodiment, it is assumed that the disc 1 is a Blu-ray Disc.

  The output information generation unit 4 includes a decoding / signal processing unit 11, a control unit (MPU: Microprocessor Unit) 12 including a Java virtual machine 12a, an AV (Audio-Visual) decoder 13, a RAM (Random Access Memory) 14, and the like. A RAM 15, a ROM (Read Only Memory) 16, a video signal processing unit 17, and an audio signal processing unit 18.

  The recorded information reading device 2 rotates the disk 1 with a motor (not shown) and irradiates the rotating disk 1 with a laser beam. Then, the laser beam reflected by the disk 1 is detected by a light receiving element (not shown), an RF (high frequency) signal output from the light receiving element is amplified, and is output to the decoding / signal processing unit 11 of the output information generating unit 4 Output.

  The decoding / signal processing unit 11 performs signal processing on the RF signal input from the recording information reading device 2, extracts video frames and audio frames, and temporarily stores them in the RAM 14.

  The AV decoder 13 includes a video decoder (not shown) and an audio decoder (not shown). The video decoder reads out a video frame from the RAM 14 and decompresses (decodes) the video frame into picture data. Then, the picture data is temporarily stored in the RAM 14. The audio decoder reads an audio frame from the RAM 14 and decompresses (decodes) the audio frame to obtain an audio signal. The audio signal is temporarily stored in the RAM 14.

  The video signal processing unit 17 includes a memory having a capacity of at least one screen, reads out the picture data stored in the RAM 14 and stores it in the memory. Then, the picture data is read from the memory at a predetermined timing, and is output as a video signal to an externally connected video device such as a TV (television). The audio signal processing unit 18 reads an audio signal from the RAM 14 and outputs it to the video apparatus at a timing synchronized with the video signal.

  The video signal processing unit 17 and the audio signal processing unit 18 output the video signal and the audio signal as digital signals when the video device supports digital signal input, and when the video device does not support digital signal input. Convert to analog signal and output.

  In the present embodiment, the decoding / signal processing unit 11, the AV decoder 13, the RAM 14, the video signal processing unit 17, and the audio signal processing unit 18 constitute a content reproduction unit.

  The ROM 16 stores a program describing the operation of the control unit (MPU) 12 and data necessary for the operation of the control unit 12, and the RAM 15 temporarily stores various data according to the operation of the control unit 12. Remembered. As will be described later, the control unit 12 allocates a data area (binding unit data area) for storing content such as movie previews and data such as additional subtitles acquired via the communication unit 19 to the RAM 15. .

  Here, it is assumed that the RAMs 14 and 15 are each formed of a volatile memory such as a DRAM (Dynamic Random Access Memory). A DRAM can write and read data at high speed, but requires power supply to hold data, and data is lost when the power is turned off.

  The control unit 12 controls the decoding / signal processing unit 11, the AV decoder 13, and the like according to a program recorded in the ROM 16. The Java virtual machine 12a is a Java application execution unit created by executing a program read from the ROM 16 by the control unit 12, and reproduces Java content.

  An operation unit (User Interface: UI) 3 is provided, for example, on the front panel of the video reproduction device 100 and receives an input operation performed by the user. The operation unit 3 includes a remote controller. The operation unit 3 detects a user operation (referred to as a UO (User Operation)) such as pressing a play key for starting reproduction of the disc 1 or a stop key for stopping the disc being reproduced, and a signal corresponding to the user operation. Is output to the control unit 12.

  The communication unit 19 is controlled by the control unit 12 and communicates with a server (external server) such as a movie distribution company via the Internet, for example.

  The local storage 20 is also controlled by the control unit 12. The local storage 20 is provided with an application data area and a binding unit data area. In the application data area, for example, high scores of games and bookmark information of favorite scenes are recorded. The binding unit data area stores contents such as movie previews, additional subtitles, and the like acquired from a server of a movie distributor. For example, a capacity of 64 kB or more is allocated to the application data area, and a capacity of 1 GB or more is allocated to the binding unit data area.

  In this embodiment, the local storage 20 is composed of a flash memory (non-volatile memory) built in the video playback device 100. However, the local storage 20 is detachable from the video playback device 100. Also good. As the detachable local storage 20, an SD card, a USB memory, or the like can be used.

  Next, content recorded on the disc 1 (Blu-ray Disc) will be described with reference to FIGS.

  FIG. 2 shows a directory structure of various contents recorded on the Blu-ray Disc. The content is recorded in accordance with the BD format (Blu-ray Disc specified format).

  The Blu-ray Disc has a spiral storage area and has a logical address space for recording logical data between the inner lead-in and the outer lead-out. In the logical address space, application data such as a file system and video data that can read out logical data using a file / directory structure is recorded.

  In the Blu-ray Disc file directory structure, a BDMV directory is placed under the ROOT directory. The BDMV directory includes an index file (index) and object files (Movie Object and BD-J Object) as general file information for ensuring interactivity with the user.

  Under the BDMV directory, a directory having information on data recorded in the disc and information on a method for reproducing the data is included. These directories are a playlist directory (PLAYLIST), a clip information directory (CLIPINF), a stream directory (STREAM), and a BD-J object directory (BDJO).

  The BD-J object directory (BDJO) includes a BD-J object file for reproducing a BD-J title.

  The stream directory (STREAM) includes a stream file recorded in a specific format in the disc. Among the streams, a stream in which video / audio / graphic information is all multiplexed is called an AV stream, and a title is composed of at least one AV stream file.

  The clip information directory (CLIPINF) includes a clip information file that has a one-to-one correspondence with the stream file. A stream file and a clip information file are collectively called a clip.

  The playlist directory (PLAYLIST) includes a plurality of playlist files. Each playlist file includes one or more play items and one or more sub play items. Each play item and sub play item specify the playback interval of a specific clip. The play item and the sub play item have information on a specific clip desired to be reproduced, for example, information on a reproduction start time and a reproduction end time.

  In the BD format, a unit called a title is recorded on a disc. The title is a playback unit corresponding to one state in the state transition of the disc content, and each title is linked to a specific object. A stream related to the title recorded in the disc is reproduced by a command or program in the object. The title includes an HDMV title and a BD-J title, and both are described in an index table defined in the BD format.

  The HDMV title is a title on which video information and interactive information are recorded by a compression method such as MPEG2, and the BD-J title is a title on which video information and interactive information executed by a Java program are recorded.

  FIG. 3 is a diagram for explaining a configuration example and an operation example of content recorded on a disc. The content has a hierarchical structure of an index, a movie object, a playlist, and a clip.

  When an index indicating the title to be played is specified, the playback program (movie object) associated with each title is specified, and the playback order of content is specified according to the command and program information provided for the specified movie object. The selected playlist is selected.

  The play list includes play items as reproduction target data information, and at least one clip for reproducing a title defined by the play item is reproduced. With this clip information, an AV stream or command that is actual data of the content is selectively read out, and playback of the AV stream or command execution processing is performed.

  In playback specifying an HDMV title, a movie object associated with the HDMV title is read, and content playback according to a specific playlist is executed by the movie object.

  In playback specifying a BD-J title, the BD-J object associated with the BD-J title is read, the Java application specified by the BD-J object is read, and the play specified by the Java application is read. Content playback is executed according to the list.

  In the BD-J mode in which the BD-J title is played back, the content can be downloaded from the web site and the acquired data can be played back in the same manner as the content recorded on the disc.

  When acquiring content via the communication unit 19, there are a case where the user operates the operation unit 3 to instruct acquisition of content, and a case where the Java application automatically acquires content during the operation.

  In the video reproduction apparatus 100 according to the present embodiment, when the control unit 12 downloads a movie trailer from a web site such as a movie distribution company via the communication unit 19, the control unit 12 can download a movie title or a performer included in the movie trailer. Movie related information (metadata) is extracted to create a movie trailer title list, and the movie trailer title list is temporarily stored in the binding unit data area of the RAM 15 together with the trailer data.

  FIG. 4 is a diagram showing an example of a movie trailer title list. As shown in FIG. 4, the movie trailer title list includes a movie title and a director / performer as movie content information forming each item of the list. In addition, movie provision information includes movie screening date, disc release date, rental start date, address information of source providing movie trailer and date (update date) when movie trailer was provided Yes. Each piece of data in the movie trailer title list is associated with trailer data.

  Hereinafter, a data management method of the video reproduction apparatus 100 according to the present embodiment will be described with reference to the flowchart of FIG. Although only management of data (content) acquired via the communication device 19 is described here, management of content recorded in the disc 1 is actually performed at the same time.

  First, when the power is turned on in step S11, the control unit 12 reads a program from the ROM 16 and starts an operation according to the program. Then, the control unit 12 mounts the Java virtual machine 12 a and allocates a binding unit data area in the RAM 15. Here, the capacity of the binding unit data area to be allocated in the RAM 15 is 500 MB, but the same capacity (for example, 1 GB) as the capacity of the binding unit data area in the local storage 20 may be allocated in the RAM 15.

  The controller 12 creates binding unit data area management data for managing data in the binding unit data area in the RAM 15 in accordance with the binding unit data area allocation.

  Thereafter, the process proceeds to step S12. When the control unit 12 receives a request for downloading related information (for example, a movie trailer) related to the content recorded on the disc 1, the process proceeds to step S13. Then, the control unit 12 determines whether the request for downloading the related information is based on a user instruction, that is, whether the user has operated the operation unit 3 to instruct the download. If it is determined that the user instruction is received (YES), the process proceeds to step S14.

  In step S14, the control unit 12 controls the communication unit 19 to establish communication connection with a predetermined server (for example, a movie distribution company server). When the related information is downloaded from the server, the process proceeds to step S15, where the control unit 12 adds a flag (additional information) indicating that the information is to be copied to the downloaded related information, and this related information is stored in the binding of the RAM 15. Save in the unit data area. The control unit 12 records information such as the data name, download date and time, and capacity in the binding unit data area management data as the related information is stored in the binding unit data area. Thereafter, the process proceeds to step S18.

  On the other hand, if the download request is not a user instruction in step S13, that is, if a download of related information is requested by the Java application, the process proceeds to step S16. Then, the control unit 12 controls the communication unit 19 to establish communication connection with a predetermined server (for example, a movie distribution company server), and download related information from the server. Next, the process proceeds to step S17, and the downloaded related information is stored in the binding unit data area of the RAM 15. Also in this case, the control unit 12 records information such as the data name, download date and time, and capacity in the binding unit data area management data as the related information is stored in the binding unit data area. Thereafter, the process proceeds to step S18.

  In this way, the related information stored in the binding unit data area in the RAM 15 is sent to the decoding / signal processing unit 11 by the Java application and stored in the data recorded on the disk 1 or the local storage 20. It is played in the same way as data.

  In step S18, it is determined whether or not there is a request to eject the disk 1. If there is no request to eject the disc 1 (in the case of NO), the process proceeds to step S19. If there is a request to eject the disc 1, for example, if the user presses the eject key of the operation unit 3, the process proceeds from step S18 to step S20. Migrate directly.

  In step S19, it is determined whether there is a power-off instruction. If there is no instruction to turn off the power (if NO), the process returns to step S18, and if there is an instruction to turn off the power, the process proceeds to step S20.

  In step S20, it is determined whether or not a flag indicating that the information is to be copied is added to the related information stored in the binding unit data area of the RAM 15. When the flag is added, the process proceeds to step S21. After the related information stored in the binding unit data area of the RAM 15 is copied to the binding unit data area of the local storage 20, the process proceeds to step S22.

  On the other hand, if it is determined in step S20 that a flag indicating that the information is to be copied has not been added to the related information, the process proceeds directly from step S20 to step S21.

  In step S22, the control unit 12 deletes (clears) the binding unit data area management data related to the binding unit data area in the RAM 15.

  In this manner, in the video playback device 100 according to the present embodiment, only the relevant information instructed to be downloaded by the user is stored in the binding unit data area of the local storage 20. As a result, the number of writes to the local storage 20 is suppressed, and deterioration of the local storage (flash memory) 20 is suppressed.

  The related information stored in the local storage 20 can be deleted by a user operation. For example, when the local storage 20 has insufficient capacity and new related information cannot be stored, the old related information may be deleted in order.

  Furthermore, in the above-described embodiment, the case where the related information designated by the user to be downloaded is automatically recorded in the local storage 20, but for example, a screen as shown in FIG. The related information may be copied from the RAM 15 to the local storage 20 only when it is instructed to be stored in the RAM 20.

(Second Embodiment)
FIG. 7 is a flowchart showing a data management method according to the second embodiment. The data management method according to the present embodiment is different from the data management method of the first embodiment in that steps S31 to S33 are provided between steps S15, S17 and S18, and the other steps are fundamental. Since it is the same as that of the data management method of 1st Embodiment, the description of the overlapping part is abbreviate | omitted here. Also in this embodiment, the structure of the video reproduction device is the same as that of the first embodiment (see FIG. 1).

  The related information stored in the binding unit data area in the RAM 15 can be signal-processed by the decoding / signal processing unit 11 and displayed on the display device. In step S31, the control unit 12 determines whether or not the related information stored in the binding unit data area of the RAM 15 is a movie trailer. When it is determined that the trailer is a movie trailer (in the case of YES), the process proceeds to step S32. When it is determined as no (in the case of NO), the process proceeds to step S18.

  In step S32, the control unit 12 determines whether or not the related information stored in the binding unit data area of the RAM 15 has been reproduced. When it is determined that the reproduction has been completed (in the case of YES), the process proceeds to step S33, and when it is determined as not (in the case of NO), the process proceeds to step S18.

  In step S33, the control unit 12 adds a flag indicating that it is a copy target to the related information. In this case, it is not necessary to add a flag again for related information to which a flag has already been added in step S15. If there are a plurality of related information, steps S31 to S33 are repeated.

  In the present embodiment, not only the related information instructed by the user but also the data of the movie trailer viewed by the user among the related information automatically downloaded by the Java application is recorded in the local storage 20. Therefore, even related information automatically downloaded by the Java application can be viewed again when the user likes it.

(Third embodiment)
FIG. 8 is a block diagram showing the configuration of the video playback apparatus according to the third embodiment. The video playback device according to this embodiment is different from the video playback device of the first embodiment in that it has a title information storage unit 21 for storing title information of a disc that has been played back in the past. In particular, this is the same as in the first embodiment. Therefore, in FIG. 8, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The disc 1 is recommended to store movie title information (movie title, director / performer, release date, etc.) as metadata. Even if the movie title information is not stored on the disc 1, the movie title information may be acquired via the Internet.

  In the video playback device 101 according to the present embodiment, the title information of the played movie is stored in the title information storage unit 21. The title information storage unit 21 is composed of a nonvolatile memory, and information is retained even when the power is turned off. Although the title information storage unit 21 is provided separately from the local storage 20 in the present embodiment, the title information storage unit 21 may be provided in the local storage 20. Further, in the case of a video playback device (so-called hard disk video recorder) provided with a hard disk, a partial area in the heart disk may be used as the title information storage unit 21.

  In the video playback apparatus 101 according to the present embodiment, the title information of the disc played up to now is stored in the title information storage unit 21 and stored in a database. Then, the control unit 12 downloads the related information via the communication unit 19, and then refers to the title information stored in the title information storage unit 21, and the downloaded related information of the movie that has been reproduced so far Check for trailers and release information. If the downloaded related information is a trailer or release information of a movie that has been reproduced so far, the related information downloaded to the RAM 15 is deleted automatically or after confirmation with the user.

  When confirming with the user, for example, a screen as shown in FIG. 9 is displayed on the display device. When the user selects “Play”, the downloaded related information is left in the RAM 15 and “Discard” is selected. Deletes the related information downloaded from the RAM 15.

  According to the present embodiment, since the downloaded related information is deleted when the downloaded related information is a trailer or release information of a movie that has been played so far, the capacity of the binding unit data area can be reduced. .

(Other embodiments)
It is conceivable that the in-vehicle video playback device has a small capacity of the local storage 20 and limits the amount of content that can be stored in the local storage 20. In such a case, part or all of the related information downloaded to the RAM 15 is transmitted to a server or other electronic device (external recording device) installed at home via a network and stored in the server or electronic device. You may make it leave. Then, the video reproduction apparatus may be appropriately connected to a home server or electronic device via a network to download necessary related information from the home server or electronic device.

  In each of the above-described embodiments, the case where a Blu-ray Disc is used as a recording medium has been described. However, the disclosed technology is applied to a video playback device that plays back video content recorded on a recording medium other than a Blu-ray Disc. You can also

1 ... disc,
2 ... Recorded information reading device,
3 ... operation part,
4 ... output information generation part,
11: Decoding / signal processing unit,
12 ... control unit,
12a ... Java virtual machine,
13 ... AV decoder,
14, 15 ... RAM,
16 ... ROM,
17 ... Video signal processing unit,
18 ... Audio signal processing unit,
19 ... communication department,
20 ... Local storage,
21 ... Title information storage unit,
100, 101... Video playback device.

Claims (20)

A recording medium on which video content is recorded can be freely attached and detached, and a recording information reading unit that reads data from the recording medium when the recording medium is attached;
A content reproduction unit that reproduces the video content by processing a signal output from the recording information reading unit;
A communication unit that communicates with an external server;
A control unit for controlling the content reproduction unit and the communication unit;
An operation unit for transmitting a user operation to the control unit;
A volatile memory connected to the control unit and capable of writing and reading data;
A non-volatile memory connected to the control unit and capable of writing and reading data;
The control unit acquires related information related to the video content recorded on the recording medium from the external server via the communication unit, and the acquired related information is input through the operation unit. It is determined whether or not it is based on an instruction, and when it is determined that it is based on a user instruction input via the operation unit, additional information indicating that it is a copy target is added to the related information to add the volatile Record in memory,
The video reproducing apparatus, wherein only the related information to which the additional information is added is copied to the nonvolatile memory among the related information recorded in the volatile memory.   The video playback apparatus according to claim 1, wherein the video content recorded on the recording medium is a movie.   The video reproduction apparatus according to claim 2, wherein the related information is a movie trailer.   4. The video according to claim 3, wherein the control unit adds additional information indicating that the related information is a copy target even when the related information is reproduced by the video content reproduction unit. Playback device.   The related information to which the additional information is added from the volatile memory to the nonvolatile memory is copied when an instruction to detach / attach the recording medium is given or an instruction to turn off the power is given. Item 5. The video playback device according to any one of Items 1 to 4. Wherein the control unit, copies the relevant information to which the additional information has been added is displayed on the display device a confirmation screen before copying in the non-volatile memory, only the relevant information copy is approved by a user in the non-volatile memory The video reproduction device according to claim 1, wherein the video reproduction device is a video reproduction device.   4. The video reproduction apparatus according to claim 1, wherein the volatile memory is a DRAM.   4. The video playback apparatus according to claim 1, wherein the nonvolatile memory is a flash memory.   The video reproducing apparatus according to claim 1, wherein the nonvolatile memory is detachable.   4. The video reproducing apparatus according to claim 2, wherein the related information includes information on a movie title, a director, and a performer.   3. The video playback apparatus according to claim 2, further comprising a title information storage unit that stores a history of video content played back by the content playback unit.   4. The control unit according to claim 1, wherein the control unit is connected to an external recording device via the communication unit, and transfers the related information recorded in the volatile memory to the external recording device. 2. The video reproduction apparatus according to claim 1. In a data management method for a video playback apparatus, in which a recording medium on which video content is recorded can be freely attached and detached, and when the recording medium is attached, the video content recorded on the recording medium is played back.
Obtaining related information related to the video content recorded on the recording medium from an external server;
It is determined whether or not the acquisition of the related information is based on a user instruction input via the operation unit. When it is determined that the acquisition is based on a user instruction input via the operation unit , a copy target is included in the related information. Adding additional information indicating that,
Recording the related information in a volatile memory;
And copying only the related information to which the additional information is added among the related information recorded in the volatile memory to a non-volatile memory.   14. The data management method according to claim 13, wherein the video content recorded on the recording medium is a movie. Between the step of acquiring the related information from the external server and the step of copying only the related information to which the additional information is added to the nonvolatile memory,
And determining whether or not the related information is a trailer of a movie that has been played back, and adding additional information indicating that it is a copy target to the related information when the trailer is a movie that has been played back. Item 15. The data management method according to Item 14.   15. The data management method according to claim 13, wherein the volatile memory is a DRAM.   15. The data management method according to claim 13, wherein the nonvolatile memory is a flash memory.   Copying of the related information to which the additional information is added from the volatile memory to the nonvolatile memory is performed when an instruction to remove or attach the recording medium is given or an instruction to turn off the power is given. The data management method according to claim 13 or 14.   The history of the reproduced video content is stored in the title information storage unit, and when the related information acquired from the external server relates to the video content stored in the title information storage unit, it is recorded in the volatile memory. The data management method according to claim 14, wherein the related information is discarded.   15. The data management method according to claim 13, wherein the related information recorded in the volatile memory is transferred to an external recording device via a communication unit.

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