A method for a user equipment for reporting aperiodic channel status information in a carrier aggregation system according to one embodiment of the present invention is carried out by the user equipment and may comprise the steps of: receiving downlink control information, comprising a CSI request field, for approving an uplink from a base station; selecting one triggering set from among a plurality of triggering sets corresponding to the particular bit value of the CSI request field; and transmitting, to the base station, CSI for at least one CC or CSI process included in the selected triggering set.