A content user terminal including a utilization unit that provides a content utilization, and an interface unit 137 that inquires the content utilization availability to the portable content usage rule management device via a wireless communication and obtains a content utilization permission data which is a inquiry result via a wireless communication. The utilization unit provides the content utilization based on the obtained content utilization permission data. The portable content usage rule management device includes a copyright data storage management unit that stores and manages the content usage rule, an interface unit that receives the inquiry result of the content utilization availability from the content user terminal via a wireless communication, and a copyright data processing is unit that responds to the received inquiry result, judges the content utilization availability based on the stored content usage rule and creates a content utilization permission data based on the judge result. The interface unit sends the created content utilization permission data to the content user terminal via a wireless communication.