Provided is a radio transmission device, which is enabled to improve a reception quality by improving the channel estimation precision of specific data such as control data. In this device, a mapping control unit (109) acquires pilot position information (at ST1010), and determines a resource block or a candidate for the mapping position of control channel data (at ST1020). The mapping control unit (109) also determines a resource block other than that candidate as the mapping position of other data (at ST1030). Moreover, the mapping control unit (109) generates a mapping control signal for instructing a mapping unit (104) the candidate of the mapping position of the control data and the mapping position of other data, that is, a mapping method, and outputs the generated mapping control signal to the mapping unit (104).