Patent ID: 7676615

Claim:
A content data storage apparatus for storing content data, and extracting the stored content data to update content data on a client apparatus, comprising: a storage content storage medium capable of storing plural groupings of the content data in association with storage content management information for managing a set of the content data and storage content identification information for identifying a group including one or a plurality of the content data; an input/output unit that performs data input/output with the client apparatus; a control unit that updates the content data of the client apparatus; and an operation unit that receives an input operation by a user, wherein the content data of the client apparatus is stored on the client apparatus in association with client content management information for managing the content data and client content identification information for identifying the content data in management units, the operation unit is capable of specifying content data for updating out of the content data on the client apparatus connected to the input/output unit, and when the control unit receives an input operation for specifying content data for updating, the control unit acquires the client content identification information of content data contained in one or a plurality of groups specified for updating out of the content data of a client apparatus connected to the input/output unit, and, if storage content identification information matching the acquired client content identification information is stored in the storage content storage medium, updates the content data of the client apparatus based on content data included in management units identified by the storage content identification information that matches the client content identification information.