bandwidth two downlink component bands and a transmission bandwidth two uplink component bands like in st 102 in st 108 communication communication targeting the uplink and downlink is performed between base station 100 and terminal 200 here with embodiment 1 fig3 and fig4 varying terminal ids terminal id a and terminal id b are configured between component bands configured for each terminal in advance by contrast with this with the present embodiment only when wideband transmission is performed only in the uplink as shown in fig9 varying terminal ids terminal id a and temporary terminal id b are configured between component bands configured for each terminal that is as shown in fig8 when the uplink and the downlink are symmetric as shown in fig8 or when wideband transmission is performed only in the downlink only terminal id a is configured for terminal 200 so that terminal 100 can configure for example terminal id b for another terminal as described above according to the present embodiment only when wideband transmission is performed only in the uplink a base station configures temporary terminal ids that is only when wideband transmission is performed only in the uplink a base station configures varying terminal ids between component bands uplink component bands for each terminal therefore with the present embodiment a base station can minimize terminal ids used per terminal by additionally configuring a terminal id temporary terminal id per terminal so that it is possible to assign enough terminal ids to more terminals in a system with the present embodiment only when wideband transmission is performed only in the uplink a base station additionally configures a temporary terminal id for each terminal like in embodiment 3 with the present embodiment a base.