JP2007188573A - Reproducing device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing device and a reproducing method capable of reproducing a content without interruption even in such a case that a data file of the content described in a play list is not recorded in the device when executing a reproduction processing based on the play list. <P>SOLUTION: When the reproduction based on the play list is instructed, prior to the reproduction, a data management part 16 compares the content of the play list and the recorded content of a data file recording part 121 to determine whether there is insufficiency in the content. When determining that there is the insufficiency in the content, the data management part 16 determines whether or not connection with a network 20 can be performed. When determining that the connection with the network 20 cannot be performed, the data management part 16 makes a reproduction processing part 15 reproduce only the content which is described in the play list and whose data file is recorded in a data file recording part 121. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a playback apparatus and a playback method that have data file recording means for recording content data files such as video and music, read out the content data files from the data file recording means means, and particularly via a network. The present invention relates to a playback apparatus and a playback method having a function of receiving a data file of content and recording it in a data file recording means.

  In recent years, in a playback device such as an audio player that plays back content such as video and music, a large-capacity recording means such as an HDD or a silicon memory has come to be used as a data file recording means for recording a content data file. In addition, a large amount of content (data file) can be recorded in the data file recording means.

  Among the contents recorded in large quantities in this way, there is a function called a playlist as a function for reproducing only a plurality of contents desired by the user according to the place and situation. The playlist is a list in which a plurality of contents selected according to the user's preference are described. In-device addresses indicating the locations where the contents are recorded, file names, and the like are described, and playback based on the playlist is instructed. Then, a plurality of contents described in the playlist are sequentially played back.

  Conventional playlists are based on the premise that content is recorded in the playback device, and cannot be used in other playback devices. That is, the content described in the playlist is not necessarily recorded on the other playback device, and even if the content described in the playlist is recorded on the other playback device, The in-device address and file name described are specific to the playback device in which the playlist has been created. In other playback devices, the corresponding content is the in-device address and file name described in the place list. Is not recorded, reproduction based on the playlist cannot be performed.

  Therefore, a new playlist that can be shared by a plurality of playback devices by describing a unique ID that identifies the content has been proposed (see, for example, Patent Document 1). By describing the unique ID in the playlist, the data file recorded in the data file recording means can be identified and reproduced based on the unique ID, and the data file is recorded in the data file recording means. Content that is not available can be collected and played back via the network based on the unique ID.

However, in the prior art, the reproduction processing of the content described in the playlist is sequentially executed, and when the reproduction processing based on the playlist is executed, the data file of the content described in the playlist is stored in the device. If the content data file is not recorded, the content data file is collected and played back via the network, and there is a problem if the content playback is interrupted.
JP 2005-100612 A

  The present invention has been made in view of such a problem, and the object of the present invention is that when a reproduction process based on a playlist is executed, a data file of content described in the playlist is stored in the device. The present invention is to provide a playback apparatus and a playback method capable of playing back content without interruption even when the content is not recorded on the screen.

In order to solve the above problems, the present invention has the following configuration.
The playback device of the present invention

Furthermore, the playback device of the present invention provides:

  In the playback apparatus and playback method of the present invention, when playback based on a playlist is instructed, a data file is stored in the playlist content and data file recording means based on the unique ID described in the playlist prior to playback. By comparing with recorded content, it is determined whether there is insufficient content that is recorded in the playlist but the data file is not recorded in the data file recording means, and there is insufficient content. If it is determined that it is in a state where it can be connected to the network, if it is determined that it is in a state where it cannot be connected to the network, it is described in the playlist and data is stored in the data file recording means. By configuring to play only the content where the file is recorded, the playlist When executing the reproduction processing based, even if the data file of the content that is described in the playlist is not recorded in the device, there is an effect that it is possible to reproduce the content without interruption.

  Furthermore, the playback apparatus and playback method according to the present invention provide a data file recording means for comparing the contents of a playlist with the contents recorded in the data file recording means and for collecting the missing files. An apparatus internal address indicating a recording position of a recorded data file is written in the playlist, and the data file is read from the data file recording means based on the apparatus internal address written in the playlist and reproduced. Thus, the recording position of the data file can be easily understood and the reading of the data file can be started quickly, so that the content can be reproduced without interruption when the reproduction process based on the playlist is executed. Play.

  Furthermore, when it is determined that the playback device and the playback method of the present invention can be connected to the network, the content described in the playlist and having the data file recorded in the data file recording means is given priority. And collecting the data file of the missing file via the network and recording it in the data file recording means by using the unique ID of the missing file. Therefore, even when the content data file described in the playlist is not recorded in the device when the playback processing based on the playlist is executed, the playback is not interrupted. There is an effect that the content can be reproduced.

  Furthermore, the playback apparatus and playback method of the present invention provides a content list comprising a unique ID of content recorded in a data file in the data file recording means and an in-device address indicating the recording position of the data file in the data file recording means. Is stored in the playlist, and the content of the playlist is compared with the content list on the basis of the unique ID described in the playlist. By configuring to determine whether there is insufficient content that has not been recorded, it is possible to quickly perform a comparison operation between the content of the playlist and the content in which the data file is recorded in the data file recording means, Time until playback starts based on playlist An effect that can be shortened.

  Furthermore, the playback apparatus and playback method of the present invention, when the content of the playlist in which the data file is recorded in the data file recording means is specified by the comparison operation, the playback of the specified content is performed in parallel with the comparison operation. Since the playback based on the playlist can be started without waiting for the end of the comparison operation, the time until the playback is started based on the playlist can be shortened. There is an effect that can be done.

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

  FIG. 1 is a block diagram showing a configuration of an embodiment of a playback apparatus according to the present invention, and FIG. 2 is a diagram showing an example of a playlist recorded in the playlist recording unit shown in FIG. These are figures which show the example of a content list recorded on the content list recording part shown in FIG.

  A playback device 10 according to the present embodiment is a portable playback device that plays back content such as video and music. With reference to FIG. 1, the playback device 10 is configured to be connectable to a network 20 such as the Internet. An information recording unit 12, a display unit 13 such as a liquid crystal display, an operation unit 14, a reproduction processing unit 15, and a data management unit 16 are provided.

  The transmission / reception unit 11 has a function of connecting to the network 20 by wire or wireless, and includes a content distribution server 30 that distributes content data files via the network 20 and an information processing device 40 such as a personal computer owned by a third party. Information communication is performed, the data file and the playlist are received from the content distribution server 30, and the playlist is received from the information processing apparatus 40, and the received data file and the playlist are recorded in the information recording unit 12. The data file received from the content distribution server 30 includes a unique ID that identifies the content. The playlist is a list of contents created by a content distributor or a third party, and at least a unique ID for specifying the contents is described as shown in FIG. Although FIG. 2 shows an example of a playlist consisting only of a unique ID for specifying content, bibliographic data such as a content name and an artist name may be described in addition to the unique ID.

  The information recording unit 12 is a recording unit such as an HDD or a silicon memory, and the data file recording unit 121 that records the data file received from the content distribution server 30, and the play received from the content distribution server 30 and the information processing device 40. A playlist recording unit 122 that records a list, and a content list recording unit 123 that records a content list that is a list of contents in which data files are recorded in the data file recording unit 121. Referring to FIG. 3, the content list includes a unique ID of the content in which the data file is recorded in the data file recording unit 121 and an in-device address indicating the recording position of the data file in the data file recording unit 121. A unique ID of the content newly recorded in the content list recording unit 123 and the in-device address are additionally recorded, and the unique ID of the content deleted from the content list recording unit 123 and the in-device address are deleted, All contents recorded in the content list recording unit 123 are always covered. FIG. 2 shows an example of a content list composed of a unique ID for identifying content and an in-device address. In addition to the unique ID and the in-device address, bibliographic data such as a content name and an artist name is described. Anyway.

  The display unit 13 is a display unit such as a liquid crystal display, and displays the video reproduced by the reproduction processing unit 15 and the playlist recorded in the content list recording unit 123.

  The operation unit 14 is an operation unit such as an operation button. The operation unit 14 is a display instruction input for instructing display of the playlist on the display unit 13, a selection input for selecting the playlist displayed on the display unit 13, and the selected playlist. A reproduction instruction input for instructing reproduction is performed.

  The reproduction processing unit 15 decompresses and reproduces the data file recorded in the data file recording unit 121 of the information recording unit 12, displays the video on the display unit 13, and outputs the audio to the connected headphones 50. To do.

  The data management unit 16 compares the content (unique ID) described in the play list instructed to be reproduced with the content (unique ID) described in the content list recorded in the content list recording unit 123. At the same time, it is determined whether the transmission / reception unit 11 is in a state where it can be connected to the network 20, and the content of the content by the reproduction processing unit 15 is determined according to the comparison result between the playlist and the content list and the connection status of the network 20. The reproduction and collection of insufficient content by the transmission / reception unit 11 are controlled. In this specification, content that is described in the playlist but has no data file recorded in the data file recording unit 121 is referred to as insufficient content.

Next, the reproduction operation of the present embodiment will be described in detail with reference to FIGS.
FIG. 4 is a flowchart for explaining the reproducing operation in the embodiment of the reproducing apparatus according to the present invention, and FIG. 5 shows an example of a playlist after collecting insufficient contents recorded in the playlist recording unit shown in FIG. FIG.

  When the reproduction of the playlist selected by the operation unit 14 is instructed, the data management unit 16 records the content (unique ID) described in the playlist instructed to reproduce and the content list recording unit 123. The content (unique ID) described in the content list is compared (step A1), and the in-device address of the content in which the data file is recorded in the data file recording unit 121 is written in the playlist. For example, when the playlist shown in FIG. 2A and the content list shown in FIG. 3 are compared, the unique IDs “## B”, “## A”, “## G”, “# Since the content of “#F” is described in the content list and the data file is recorded in the data file recording unit 121, as shown in FIG. 2B, the unique ID “## B”, “## A” ”,“ ## G ”,“ ## F ”, the corresponding in-device address is written.

  Next, the data management unit 16 is described in the playlist, but is not described in the content list, that is, the data file is not recorded in the data file recording unit 121 although it is described in the playlist. It is determined whether or not content exists (step A3). In the present embodiment, the play list is compared with the content list to determine whether there is insufficient content. However, the data file recording unit 121 records the unique ID together with the data file. In addition, it may be determined whether there is insufficient content by comparing the playlist and the unique ID recorded in the data file recording unit 121.

  If there is no missing content in step A3, that is, if all the data files of the content described in the playlist are recorded in the data file recording unit 121, the in-device address for all the content in the playlist. The data management unit 16 instructs the reproduction processing unit 15 to reproduce all the contents based on the playlist, and the reproduction processing unit 15 is based on the in-device address written in the playlist. Then, the data files of all contents described in the playlist are read from the data file recording unit 121 and sequentially played back (step A4), and the playback processing operation is terminated.

  If there is insufficient content in step A3, the data management unit 16 determines whether or not the transmission / reception unit 11 is in a state where it can be connected to the network 20 (step A5), and is not in a state where it can be connected to the network 20. In this case, the reproduction processing unit 15 reproduces the content in which the data file is recorded in the data file recording unit 121 of the content described in the playlist, that is, the content in which the in-device address of the playlist is written. The reproduction processing unit 15 reads out only the content data file in which the in-device address of the playlist is written from the data file recording unit 121 and sequentially reproduces it (step A6), and ends the reproduction processing operation.

  If the data management unit 16 can connect to the network 20 in step A5, the data management unit 16 outputs the unique ID of the insufficient content to the transmission / reception unit 11 to instruct the transmission / reception unit 11 to collect the insufficient content, and The reproduction processing unit 15 is instructed to reproduce all contents described in the playlist. The transmission / reception unit 11 collects the insufficient content, that is, requests the content distribution server 30 to transmit the data file of the insufficient content based on the unique ID, and receives the data file of the insufficient content transmitted from the content distribution server 30. The information is recorded in the data file recording unit 121 of the information recording unit 12 and the in-device address of the recorded data file is written in the playlist. As a result, all the contents described in the playlist are recorded in the data file recording unit 121, and the in-device address is written for all the contents of the playlist as shown in FIG. The reproduction processing unit 15 reads out data files of all contents described in the playlist from the data file recording unit 121 and reproduces them sequentially based on the in-device address written in the playlist (step A7). The playback processing operation ends.

Next, the reproduction operation performed together with the insufficient content collection operation of the present embodiment will be described in detail with reference to FIGS.
FIG. 6 is a flowchart for explaining the reproduction operation performed together with the insufficient content collection behavior in the embodiment of the reproduction apparatus according to the present invention, and FIG. 7 is the reproduction operation in the embodiment of the reproduction apparatus according to the present invention. It is explanatory drawing explaining the order change process of time.

  In step A7 shown in FIG. 4, since the content collection operation by the transmission / reception unit 11 and the content reproduction operation by the reproduction processing unit 15 are performed in parallel, depending on the order of reproduction and the collection speed, There is a possibility that content that is not recorded in the data file recording unit 121 during collection may be subject to playback, and in this case, playback order switching processing is performed.

  First, the data management unit 16 sets the variable n to 1 (step B1), and sets whether or not the nth content described in the playlist exists with the nth content as a reproduction target, that is, data It is determined whether or not the in-device ID is recorded in the play list and recorded in the file recording unit 121 (step B2). If it exists, the nth content described in the play list is reproduced. The reproduction processing unit 15 instructs the reproduction processing unit 15 to read out the data file of the nth content described in the playlist from the data file recording unit 121 and reproduce based on the in-device address of the nth content. (Step B3).

  The data management unit 16 monitors the end of playback of the nth content (step B4), and when playback of the nth content ends, whether or not there is the next content, that is, content that has not been played is played. It is determined whether or not it is listed (step B5). If there is no next content, the playback operation is terminated. If there is a next content, n is incremented and the process returns to step B1 ( Step B6).

  If the n-th content described in the playlist in step B1 does not exist, the n-th content to be played back is before or during the collection, so the order of playing back the playback target content later A replacement process is performed (step B7), n is incremented, and the process returns to step B1 (step B8). As a result, even if the content to be played back is before or during collection, other content in which the data file is recorded in the data file recording unit 121 is played back first, and playback is not interrupted.

  As the order change process, for example, as shown in FIG. 2B, when the second content does not exist and the second content becomes a reproduction target, as shown in FIG. In addition, the content to be reproduced (second) may be descended in the next order (fourth) of the content that has not been reproduced and recorded in the data file recording unit 121, Further, as shown in FIG. 7B, the reproduction target (second) content may be descended in the latest order (seventh).

  As described above, according to the present embodiment, when the reproduction based on the playlist is instructed by the operation unit 14, the data management unit 16 is based on the unique ID described in the playlist prior to the reproduction. The content of the playlist is compared with the content in which the data file is recorded in the data file recording unit 121, so that the data is recorded in the playlist, but the data file is not recorded in the data file recording unit 121. It is determined whether or not there is insufficient content, and when it is determined that there is insufficient content, it is determined whether or not the transmission / reception unit 11 is in a state where it can be connected to the network 20 and is in a state where it cannot be connected to the network 20 If it is determined that the data file is recorded in the playlist, the data file recording unit 121 stores the data file. Is configured so that only the content recorded is reproduced by the reproduction processing unit 15, the content data file described in the playlist is stored in the apparatus when the reproduction processing based on the playlist is executed. Even when it is not recorded, the content can be reproduced without interruption.

  Furthermore, according to the present embodiment, the data management unit 16 performs the comparison operation between the content of the playlist and the content in which the data file is recorded in the data file recording unit 121 and the collection of the insufficient files. The in-device address indicating the recording position of the data file recorded in the data file recording unit 121 is written in the playlist, and the reproduction processing unit 15 starts from the data file recording unit 121 based on the in-device address written in the playlist. By configuring the data file to be read and played, the recording position of the data file can be easily understood and the data file can be read quickly, so that when playback processing based on a playlist is executed The effect of being able to play content without interruption Unlikely to.

  Further, according to the present embodiment, when the data management unit 16 determines that the transmission / reception unit 11 is in a state in which the transmission / reception unit 11 can be connected to the network 20, the data management unit 16 describes the data in the playlist and stores the data in the data file recording unit 121. The content in which the file is recorded is preferentially reproduced by the reproduction processing unit 15, and the data file of the insufficient file is collected by the transmission / reception unit 11 via the network 20 using the unique ID of the insufficient file. Since it is possible to prevent the reproduction of the data file of the missing file from being stopped due to the collection, it is recorded in the playlist when the reproduction process based on the playlist is executed. Even if the data file of the content is not recorded in the device, An effect that it is possible to reproduce the content without expiring.

  Furthermore, according to the present embodiment, a content list including a unique ID of content recorded in the data file in the data file recording unit 121 and an in-device address indicating the recording position of the data file in the data file recording unit 121 Is stored in the content list recording unit 123, and the data management unit 16 compares the content of the playlist with the content list on the basis of the unique ID described in the playlist, and is described in the playlist. However, by determining whether or not there is insufficient content in which the data file is not recorded in the data file recording unit 121, the data file is recorded in the playlist content and the data file recording unit 121. Quick comparison with existing content Can an effect that it is possible to shorten the time until reproduction is started on the basis of the play list.

  Further, according to the present embodiment, when the content of the playlist in which the data file is recorded in the data file recording unit 121 is specified by the comparison operation, the data management unit 16 determines the content specified in parallel with the comparison operation. By configuring the playback to be started by the playback processing unit 15, playback based on the playlist can be started without waiting for the end of the comparison operation. Therefore, until playback is started based on the playlist. There is an effect that the time can be shortened.

  In the present embodiment, when there is insufficient content and the network 20 is connectable, all the content described in the playlist is sequentially played while performing the order change process. Although configured, the content in which the data file is recorded in the data file recording unit 121 may be sequentially reproduced in order, and the data file of the insufficient content may be collected in parallel with the reproduction. In this case, while reproducing the content in which the data file is recorded in the data file recording unit 121, the data file of the insufficient content is collected and the content in which the data file is recorded in the data file recording unit 121 After the end of playback, the insufficient content collected in the data file can be played back without delay. In addition, when there is insufficient content and it is in a state where it can be connected to the network 20, only the content in which the data file is recorded in the data file recording unit 121 is sequentially played back, and the shortage content in parallel with the playback. You may make it collect the data file of. In this case, when the same playlist is reproduced next time, the data files of all the contents described in the playlist are recorded in the data file recording unit 121.

  Further, in the present embodiment, the configuration is such that the playlist and the content list are compared after the playback instruction input for instructing playback of the playlist is performed. Compare the playlist with the content list over time, write the in-device address of the content in which the data file is recorded in the data file recording unit 121 to the playlist, and the content without the in-device address is insufficient You may make it recognize as a file. In this case, since the comparison operation between the playlist and the content list can be omitted after the reproduction instruction input for instructing the reproduction of the playlist is performed, the time until the reproduction is started is shortened. Can do. However, in this case, when the data file recorded in the data file recording unit 121 is changed (added or deleted), it is necessary to compare the playlist with the content list again.

  In the present embodiment, the playlist is reproduced after the comparison between the playlist and the content list is completed. However, data is stored in the data file recording unit 121 by the comparison between the playlist and the content list. If playback of the content is started at the stage where the content in which the file is recorded is found, the time from when the playback instruction input for instructing playback of the playlist is performed until playback is started is shortened. be able to.

  It should be noted that the present invention is not limited to the above-described embodiments, and it is obvious that each embodiment can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention. In each figure, the same numerals are given to the same component.

It is a block diagram which shows the structure of embodiment of the reproducing | regenerating apparatus based on this invention. It is a figure which shows the example of a playlist recorded on the playlist recording part shown in FIG. It is a figure which shows the example of a content list recorded on the content list recording part shown in FIG. It is a flowchart for demonstrating the reproduction | regeneration operation | movement in embodiment of the reproducing | regenerating apparatus based on this invention. It is a figure which shows the example of a playlist after insufficient content collection recorded on the playlist recording part shown in FIG. It is a flowchart for demonstrating the reproduction | regeneration operation | movement performed with the insufficient content collection operation | movement in embodiment of the reproducing | regenerating apparatus based on this invention. It is explanatory drawing explaining the order change process at the time of reproduction | regeneration operation | movement in embodiment of the reproducing | regenerating apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Playback apparatus 11 Transmission / reception part 12 Information recording part 13 Display part 14 Operation part 15 Playback processing part 16 Data management part 20 Network 30 Content distribution server 40 Information processing apparatus 50 Headphone 121 Data file recording part 122 Playlist recording part 123 Content list recording Part

Claims (14)

A playback device that includes a data file recording unit that records a data file of content, reads the data file of the content from the data file recording unit, and plays back the data file;
A transmission / reception means for receiving the data file of the content via a network and recording it in the data file recording means;
Playlist recording means for recording a playlist that is a list of the content to be played back and at least a unique ID that identifies the content is recorded;
When playback based on the playlist is instructed, the data file is recorded in the content of the playlist and the data file recording means based on the unique ID described in the playlist prior to playback. A content for determining whether or not there is a shortage content that is described in the playlist but is not recorded in the data file in the data file recording means by performing a comparison operation for comparing the content with the content A comparison means;
Connection determining means for determining whether or not the transmitting / receiving means is connectable to the network when the content comparing means determines that there is the insufficient content;
When the connection determining means determines that the transmission / reception means is in a state incapable of connecting to the network, the content described in the playlist and having the data file recorded in the data file recording means And a data management means for reproducing only the data. The content comparison unit writes an in-device address indicating a recording position of the data file recorded in the data file recording unit to the playlist.
2. The reproducing apparatus according to claim 1, wherein the data management means reads and reproduces the data file from the data file recording means based on the in-device address written in the playlist.   The data managing means is described in the playlist when the connection judging means judges that the transmission / reception means can be connected to the network, and the data file is recorded in the data file recording means. The recorded content is preferentially reproduced, and the data file of the missing file is collected via the network by the transmitting / receiving means using the unique ID of the missing file and recorded in the data file recording means The reproducing apparatus according to claim 1 or 2, wherein   The data management means, when the data file of the content to be played back is not recorded in the data file recording means before or during the collection, reordering processing to postpone playback of the content to be played back The playback apparatus according to claim 3, wherein:   5. The playback apparatus according to claim 3, wherein the transmission / reception means writes an in-device address indicating a recording position of the data file collected and recorded in the data file recording means to the playlist. Content list recording for storing a content list including the unique ID of the content in which the data file is recorded in the data file recording means and an in-device address indicating a recording position of the data file in the data file recording means Comprising means,
The content comparison means compares the content of the playlist with the content list based on the unique ID described in the playlist, so that the data file is described in the playlist. 6. The reproducing apparatus according to claim 1, wherein it is determined whether or not there is an insufficient content in which the data file is not recorded in the recording means.   When the content of the playlist in which the data file is recorded in the data file recording unit is identified by the comparison operation of the content comparison unit, the data management unit reproduces the identified content. 7. The reproducing apparatus according to claim 1, wherein the reproducing apparatus is started in parallel with the comparison operation by the comparison means. A reproduction method for reading and reproducing the data file of the content recorded in a data file recording means,
When reproduction based on a playlist in which at least a unique ID that identifies the content is listed is instructed to be reproduced, the reproduction is based on the unique ID described in the playlist. The data file is described in the playlist by executing a comparison operation for comparing the content of the playlist with the content in which the data file is recorded in the data file recording means. Determining whether there is insufficient content in which the data file is not recorded in the recording means;
When it is determined that there is the insufficient content, it is determined whether or not the network is connectable,
When it is determined that the network cannot be connected, only the content described in the playlist and in which the data file is recorded in the data file recording unit is played back. Method. In-device address indicating the recording position of the data file recorded in the data file recording means during the comparison operation between the content of the playlist and the content in which the data file is recorded in the data file recording means To the playlist,
9. The reproducing method according to claim 8, wherein the data file is read from the data file recording means and reproduced based on the in-device address written in the playlist.   If it is determined that the network is connectable, the content recorded in the playlist and having the data file recorded thereon is preferentially played back and the shortage 10. The reproducing method according to claim 8, wherein the data file of the insufficient file is collected and recorded in the data file recording unit via the network using the unique ID of the file.   When the data file of the content to be played back is not recorded in the data file recording means before or during the collection, a reordering process is performed to postpone playback of the content to be played back. The reproducing method according to claim 10.   12. The reproducing method according to claim 10, wherein an in-device address indicating a recording position of the data file collected and recorded in the data file recording means is written in the playlist. In the data file recording unit, a content list including the unique ID of the content recorded in the data file and an in-device address indicating a recording position of the data file in the data file recording unit is stored,
By comparing the content of the playlist with the content list based on the unique ID described in the playlist, the data is recorded in the data file recording means. 13. The reproducing method according to claim 8, wherein it is determined whether or not there is insufficient content in which no file is recorded.   When the content of the playlist in which the data file is recorded in the data file recording unit is specified by the comparison operation, reproduction of the specified content is started in parallel with the comparison operation. The playback apparatus according to any one of claims 8 to 13.

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