The present invention relates to a wireless communication system. More particularly, the present invention relates to a method for transmitting a content using a cache memory, and a method for transmitting, by a relay node, a content using a cache memory according to the present invention may comprise the steps of: storing a first content, received from a serving cell, in the cache memory; storing a second content, received from an adjacent cell or the serving cell, in the cache memory; selecting a content to be transmitted to a user equipment (UE) from among the first content requested by the UE and the second content which acts as interference to the first content; and transmitting the second content to the UE.