A parity bit generating section 110 generates parity bits of FEC for error
correction from transmission data. A transmission power deciding section 111
decides transmission power at the time of retransmitting the parity bits from
the number of information bits of transmission data and the number of parity bits.
A transmission power controller 112 controls transmission power based on
information decided by the transmission power deciding section 111 and outputs
the resultant to a radio transmission section 104.