A communication apparatus according to the present disclosure includes a receiver configured to receive upward data being transmitted from a terminal during an upward period from a terminal transmission start time to a terminal transmission end time in an upward slot, during an own apparatus reception period being equal in length to the upward period from an own apparatus reception start time being later than the terminal transmission start time by a propagation delay time; and a transmitter configured to transmit downward data during an own apparatus transmission period being equal in length to a downward period from an own apparatus transmission start time being earlier than a terminal reception start time by the propagation delay time, in such a way that the terminal receives the downward data during the downward period from the terminal reception start time to a terminal reception end time in a downward slot.