Provided are an interference alleviation method performed by a first base station in a wireless communications system comprising the first base station and a second base station using adjacent resources, and an apparatus using the method. The method is characterized by obtaining an uplink-downlink configuration applied by the second base station, and determining different downlink transmission powers for a first subframe of the first base station, which overlaps a subframe in which the second base station performs downlink transmission, and for a second subframe of the first base station, which does not overlap said subframe.