Patent ID: 7711698

Claim:
A communication system, comprising: a first storage unit configured to store a plurality of pieces of contents information; a second storage unit configured to store a plurality of pieces of contents information; a control unit configured to control access of at least one piece of contents information stored in said first storage unit and said second storage unit based on a single set of management information, said single set of management information includes a content ID of the at least one piece of contents information and corresponding address information that indicates a location where the at least one piece of contents information is stored, and manage both said first storage unit and said second storage unit; a communication unit configured to interconnect said first storage unit, said second storage unit and said control unit and configured for communication, wherein the at least one piece of contents information selected by a selection unit is transferred from said second storage unit to said first storage unit through said communication unit; an accounting setting unit configured to set an amount of money to be imposed on a user in response to a use of said second storage unit; an erasure unit configured to erase the at least one piece of contents information stored in said first storage unit; the control unit further receives a request from the user for transferring again the at least one piece of content information from said second storage unit to said first storage unit, wherein content ID of the transferred at least one piece of contents information and the content ID of the erased at least one piece of contents information in said first storage unit are the same and managed by said single set of management information; and said accounting setting unit sets a smaller amount of money than a normal charge to be imposed on the user in response to the transferring request.