| 摘要 |
Index data is automatically formed with respect to music data recorded on a recording medium. In the index data, statuses showing states of the music data such as reproducible data, data which was moved to another recording medium and whose reproduction is inhibited, and deleted data are provided for each music data. The status is changed in association with a change in state of the music data. For example, when the music data which was moved to another recording medium and whose reproduction is inhibited is returned from a move destination, the status is changed so as to indicate a reproducible state. Index data which does not exist on the recording medium can be formed in the outside and newly added. Information of the music data possessed by the user can be managed in a lump by using the index data.
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