| 摘要 |
To provide means for accessing a content data stream efficiently even when the data stream is stored on multiple files. A data processor according to the present invention can write a content data stream on a medium. The data stream includes a plurality of pictures and a playback unit with one or more decoding units that need to be decoded from a base picture. The data processor includes: at least one of an encoder for generating the data stream and a receiving section for receiving the data stream; and a media control section for writing the data stream on the medium. If the size of a file, on which the data stream is being written, has exceeded a predetermined value, the media control section goes on to write the data stream on another file, generates a piece of information showing that the stored data of the playback unit has been split into these files, and writes the information on the medium.
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