The present invention relates to a wireless communication system and, more specifically, to a method for an operation of cancelling or mitigating interference, and an apparatus therefor. A method of cancelling or mitigating interference in a wireless communication system performed by a terminal includes receiving, from a serving cell, restricted configuration information of an enhanced physical downlink control channel (EPDCCH) which a dominant interference cell transmits, detecting the EPDCCH using the restricted configuration information of the EPDCCH, and performing an operation of cancelling or mitigating interference for the dominant interference cell using the detected EPDCCH, wherein the restricted configuration information of the EPDCCH includes a restricted set of parameters related to the EPDCCH configurable by the dominant interference cell.