A communication apparatus 1 includes a number-of-units determination unit 2 which determines the number of resource units to be allocated respectively to plural physical control channels by proportionally dividing the total number of resource units included in wireless resource which is designated for mapping of physical control channels among the plural physical control channels in accordance with a predetermined rule; a channel encoding unit 3 which channel-encodes the control information to be transmitted on the plural physical control channels respectively into data which can be transmitted by the number of resource units determined by said number-of-units determination unit; a modulation unit 4 which modulates the channel-encoded control information; and a transmission unit 5 which transmits the signal modulated by the modulation unit.