A repeater capable of improving the data decoding performance at a base station while achieving sharing of processing for data exchange between repeaters and initial data transmission to the base station (eNB) is provided. A repeater 100 which cooperates with another repeater 200 to relay data to a base station 300 includes a storage section 113 which stores first data of the local apparatus, a receiving section 101 which receives at least a portion of the second data of another repeater 200, an interleave section 111 which applies interleaving to at least a portion of the first data and the second data in accordance with a difference in propagation quality between the base station 300 and each of the repeaters, and segments data after interleaving, and a transmitting section 116 which, if data after interleaving is segmented, transmits segmented data to the base station.