Playback apparatus, playback method, program, recording medium, and data structure

A playback method comprising:

• obtaining, using circuitry of a playback apparatus, (i) playback management information including a main playback path indicating a position of an AV stream file recorded on a recording medium and (ii) second information having at least one sub playback path indicating positions of a plurality of sub files including accompanying data to be played back with playback of main image data included in the AV stream file, each of the plurality of sub files being designated in the sub playback paths by a sub play item in-time and a sub play item out-time common to each sub file and by a specific subclip entry ID uniquely set for each sub file;
• selecting, using the circuitry of the playback apparatus, accompanying data to be played back from supplementary streams or data files different from a main AV stream, referred to by the sub playback paths;
• reading, using the circuitry of the playback apparatus and when the selected accompanying data is included in a sub file referred to by a sub playback path, the sub file referred to by the sub playback path together with the AV stream file referred to by the main playback path;
• and
• playing back, using the circuitry of the playback apparatus, the main image data included in the AV stream file and the accompanying data included in the selected sub file.