A method is provided for receiving control information by a user equipment (UE) in a wireless communication system. The UE receives information on a time-resource region in which common search space (CSS) monitoring on a legacy physical downlink control channel (PDCCH) is performed. The UE further receives monitoring information on a CSS on an enhanced PDCCH (EPDCCH). The UE detects control information according to the monitoring information. If the time-resource region in which the CSS monitoring on the legacy PDCCH is performed is identical to the time-resource region in which CSS monitoring on the EPDCCH is performed, the control information is detected by monitoring a CSS determined according to a transmission mode of the UE.