| 摘要 |
When original data are stored, an association information storage area is reserved for each of the original data. When the original data are referred to by a playlist function and a partial area of the original data is registered in a playlist, an identifier for identifying the playlist that made the reference uniquely is stored in the association information storage area that the referred original data have. If a user issues an instruction to delete the original data, the association information storage area of the original data to be deleted is referred to, so that the stored identifier of the playlist of the reference origin is obtained. The playlist of the reference origin is identified based on the obtained identifier, and the identified playlist is deleted or edited.
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