A timing controller (22) generates timing information Tf when a packet transceiver (21) sets up a connection so that packets may be evenly dispersed, and informs the packet transceiver (21) and a base station (3) of the timing information (Tf). The packet transceiver (21) generates a packet in accordance with a frame offset value specified by the timing information (Tf). Therefore packets arrive at a packet multiplexer in a packet transmission period at averaged timings. The waiting time of the packet multiplex transmission is shortened. Therefore, a transmission link (L1) can be efficiently used while satisfying the service quality demanded.