A joint subscriber management system includes a joint subscriber management unit for acting as a surrogate in performing a registration activity for enabling a receiver to receive a broadcast and/or an electronic commerce transaction. A reception unit receives a reception-limiting identification number of the receiver for receiving a specific broadcast, a broadcaster identification number of at least one broadcaster of a plurality of broadcasters, and registrant information concerning registration of a user allocated to the reception-limiting identification number. A generation unit generates a joint management identification number corresponding to the received reception-limiting identification number. A recording unit records the reception-limiting identification number, the joint management identification number, and the registrant information in a registrant information table in correspondence with one another. A management/operation unit acts as a surrogate in member management and the electronic commerce transaction in accordance with the registrant information table.