Provided is a radio communication base station device capable of reducing a communication overhead by a control channel such as SCCH (Shared Control Channel). In this device, each encoding unit (11) executes an encoding process for SCCH of each movement station, each modulation unit (12) executes a modulation process for the SCCH after being encoded, a distribution unit (102) arranges the SCCH to each movable station to one of subcarriers constituting an OFDM symbol, and a transmission power control unit (103) controls the SCCH transmission power according to received quality information reported from each movable station. An MCS setting unit (120) sets MCS in the encoding/modulation units (101-1 to 101-n) according to the SCCH-multiplexed number.