| 摘要 |
<p>A data storage unit (111) which stores attribute management information for managing attribute information of a content file included in data recorded on a recording medium which has been used previously and medium management information including partial medium identification information designated in each predetermined part by at least one of a content file placed immediately under a layer formed in the data recorded on the recording medium and a layer, a medium identification information comparison unit (107) which compares partial medium identification information generated from data of the recording medium which is going to be used and the partial medium identification included in the medium management information, and a tag management information update unit (113) which updates the attribute information partially when a result of the comparison indicates disagreement are included.</p> |
