By reducing the overlap between HARQ subpackets transmitted by means of a transmitting MS and a cooperative MS, the disclosed method is capable of increasing gains in HARQ IR signal synthesis. The method transmits a hybrid automatic repeat request (HARQ) in a cooperative communication system formed so as to comprise a transmitting mobile station (MS) and a cooperative MS, and involves creating individual HARQ subpackets transmitted by means of the transmitting MS and the cooperative MS such that said subpackets are arranged in mutually opposite directions in a circular buffer.