To efficiently transmit control channels to various communicable communication terminals with different band widths in a communication system including a plurality of resource blocks wherein each of a plurality of frequency blocks configuring the system frequency band includes one or more subcarriers.

The base station comprises a means for managing the frequency blocks, a means for determining scheduling information for each frequency block to allocate the one or more of resource blocks to communication terminals in a good channel state, a means for creating the control channel including the scheduling information for each frequency block and a means for frequency-multiplexing the control channels within the system frequency band and transmitting them on a multi-carrier basis. The base station also transmits the control channels divided into nonspecific control channels decoded by nonspecific communication terminals and the specific control channels decoded by the communication terminals to which the one or more resource blocks are allocated.

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