1. A method for receiving a physical downlink control channel (PDCCH) at a downlink subframe through a user equipment (UE) in a wireless communication system, the method comprising the step of: detecting the PDCCH by performing blind decoding for a search space including a plurality of PDCCH candidates included in the downlink subframe, wherein the blind decoding is performed in accordance with order of priority given to each of a plurality of sub-search spaces constituting the search space.