Provided is a terminal (200) which notifies a base station (100) of response signals generated by bundling error detection results for the downlink data of a first band and a second band and in which a calculating unit (204) receives the downlink data for each band, a CRC unit (211) detects any errors in the downlink data, and an answer signal generating unit (212) generates answer signals by bundling error detection results on the basis of the bit number ratio of the error detection results for the first band and the second band, so that the total number of bits in the error detection results for the downlink data obtained using the CRC unit (211) is the number of notification bits in the response signals.