A first GW function block (6) transmits packet data to a first base station (1). A second GW function block (7) is able to communicate with the first base station (1), a second base station (2), and the first GW function block (6). A control function block (5) signals information related to a communication path configuration to transfer the packet data. Setup of a communication path, to transmit the packet data to the base station (1) from the GW function block (6) through the GW function block (7), is performed based on first packet data communication information signaled by the control function block (5). Setup of a communication path, to transmit the packet data to the base station (2) from the GW function block (7), is performed based on at least one of the first packet data communication information, second packet data communication information signaled by the control function block (5) to the base station (1), and third packet data communication information signaled by the control function block (5) to the GW function block (7).