A method for transmitting uplink control information in a wireless communication system, the method performed by a user equipment, UE, which is configured with a plurality of serving cells and comprising: receiving downlink control information on at least one physical downlink control channel, PDCCH, in a first subframe through a first serving cell among the plurality of serving cells; receiving data on at least one physical downlink shared channel, PDSCH, in the first subframe through at least one serving cell among the plurality of serving cells based on the downlink control information; and transmitting acknowledgement/negative-acknowledgement, ACK/NACK, indicating success or failure of decoding of the data in a second subframe, wherein the ACK/NACK is transmitted by using a first resource within the second subframe when the data is received only through the first serving cell, wherein the ACK/NACK is transmitted by using a second resource within the second subframe when the data is received through two or more serving cells from among the plurality of serving cells, wherein the first resource is allocated dynamically by a PDCCH which schedules the first serving cell and the second resource is predetermined, wherein the first serving cell is a primary cell in which the UE carries out a procedure of establishing an initial connection to a base station or a procedure of re-establishing a connection, wherein a PDCCH, which schedules a serving cell except for the first serving cell from among the at least one PDCCH, includes PDSCH aggregate information indicating the total number of PDSCHs transmitted through a plurality of serving cells in the first subframe, and wherein the PDSCH aggregate information is transmitted through a transmission power control, TPC, field of an uplink component carrier. receiving downlink control information on at least one physical downlink control channel, PDCCH, in a first subframe through a first serving cell among the plurality of serving cells; receiving data on at least one physical downlink shared channel, PDSCH, in the first subframe through at least one serving cell among the plurality of serving cells based on the downlink control information; and transmitting acknowledgement/negative-acknowledgement, ACK/NACK, indicating success or failure of decoding of the data in a second subframe, wherein the ACK/NACK is transmitted by using a first resource within the second subframe when the data is received only through the first serving cell, wherein the ACK/NACK is transmitted by using a second resource within the second subframe when the data is received through two or more serving cells from among the plurality of serving cells, wherein the first resource is allocated dynamically by a PDCCH which schedules the first serving cell and the second resource is predetermined, wherein the first serving cell is a primary cell in which the UE carries out a procedure of establishing an initial connection to a base station or a procedure of re-establishing a connection, wherein a PDCCH, which schedules a serving cell except for the first serving cell from among the at least one PDCCH, includes PDSCH aggregate information indicating the total number of PDSCHs transmitted through a plurality of serving cells in the first subframe, and wherein the PDSCH aggregate information is transmitted through a transmission power control, TPC, field of an uplink component carrier.