A base station, for transmitting common information and control information, includes a common information generating unit that generates the control information and the common information, a lower-layer control information generating unit that generates first lower-layer control information indicating a radio resource where the control information is to be placed and second lower-layer control information indicating a radio resource where the common information is to be placed. The base station also includes a multiplexing unit that multiplexes the first lower-layer control information and the control information and multiplexes the second lower-layer control information and the common information, the system bandwidth being divided into a plurality of frequency blocks each corresponding to a minimum value of maximum transmission and reception bandwidths used by the plural mobile stations, and a transmitting unit that transmits the multiplexed first lower-layer control information, control information, second lower-layer control information, and common information.