The present invention provides a method for transmitting/receiving data to/from a relay. The data transmitting/receiving method comprises the steps of: enabling the relay to receive data on an nth subframe of a downlink from a base station; determining the position of the subframe of an uplink to which data is to be transmitted, if any data to be transmitted exists, wherein the position of said subframe is determined as the (n+k)th subframe, wherein said k is determined by the value of said n and by information on a preset HARQ; and transmitting the data on an (n+k)th subframe of the uplink.