A method for a terminal reporting an aperiodic channel state information, CSI, report for a plurality of cell groups in a wireless communication system, the method comprising: receiving (S710) an aperiodic CSI report request from a base station; calculating (S720) the aperiodic CSI report for one or more aperiodic CSI measurement target Component Carriers, CCs, indicated by the aperiodic CSI report request, wherein the component carriers belong to the plurality of cell groups; and transmitting (S730) the calculated aperiodic CSI report to the base station, characterized in that : if a Physical Uplink Control Channel, PUCCH, is configured to be transmitted in a Secondary Cell, SCell in addition to a Primary Cell, PCell, and a total number of CCs in the plurality of cell groups is equal to or less than a predetermined number, the aperiodic CSI measurement target CCs are configured for all downlink CCs and not for each of the plurality of cell groups, and a single aperiodic CSI report is triggered, if PUCCH is configured to be transmitted in the PCell only and a total number of CCs in the plurality of cell groups is more than the predetermined number, the aperiodic CSI measurement target CCs are configured independently for each of the plurality of cell groups, and a plurality of aperiodic CSI reports is triggered for the each of the plurality of cell groups. receiving (S710) an aperiodic CSI report request from a base station; calculating (S720) the aperiodic CSI report for one or more aperiodic CSI measurement target Component Carriers, CCs, indicated by the aperiodic CSI report request, wherein the component carriers belong to the plurality of cell groups; and transmitting (S730) the calculated aperiodic CSI report to the base station, characterized in that : if a Physical Uplink Control Channel, PUCCH, is configured to be transmitted in a Secondary Cell, SCell in addition to a Primary Cell, PCell, and a total number of CCs in the plurality of cell groups is equal to or less than a predetermined number, the aperiodic CSI measurement target CCs are configured for all downlink CCs and not for each of the plurality of cell groups, and a single aperiodic CSI report is triggered, if PUCCH is configured to be transmitted in the PCell only and a total number of CCs in the plurality of cell groups is more than the predetermined number, the aperiodic CSI measurement target CCs are configured independently for each of the plurality of cell groups, and a plurality of aperiodic CSI reports is triggered for the each of the plurality of cell groups. if a Physical Uplink Control Channel, PUCCH, is configured to be transmitted in a Secondary Cell, SCell in addition to a Primary Cell, PCell, and a total number of CCs in the plurality of cell groups is equal to or less than a predetermined number, the aperiodic CSI measurement target CCs are configured for all downlink CCs and not for each of the plurality of cell groups, and a single aperiodic CSI report is triggered, if PUCCH is configured to be transmitted in the PCell only and a total number of CCs in the plurality of cell groups is more than the predetermined number, the aperiodic CSI measurement target CCs are configured independently for each of the plurality of cell groups, and a plurality of aperiodic CSI reports is triggered for the each of the plurality of cell groups. <EOS>