To provide a content management system that manages the original of electronic contents data to deal with an increase in electronic data and maintain the uniqueness of the original.

The series management of contents and a history of processes on the contents are managed by an original management main device (1) and only the contents data are stored in portable media (4-1 to 4-3) having respective media IDs. The system is therefore capable of easily dealing with an increase in electronic data and a history of updates to the original can be managed by the system. Because the media with their characteristic media IDs are used as original data, the original can be determined to be the unique one according to the media ID.