In a wireless communication system where a terminal and a base station communicate with each other using a frame including at least one downlink sub-frame and at least one uplink sub-frame, the terminal and the base station calculate the number of hybrid automatic repeat request (HARQ) feedback regions of the downlink sub-frames and the uplink sub-frames in accordance with a third value corresponding to an absolute value of subtraction between a first value corresponding to the number of downlink sub-frames of the frame and a second value corresponding to the number of uplink sub-frames of the frame or the sum of the first value and the second value and configure HARQ feedback regions in the downlink sub-frames and the uplink sub-frames.