A method for transmitting control information by a user equipment, UE, in a wireless communication system, the UE configured with a primary cell set to uplink-downlink, UL-DL, configuration #0 and a secondary cell set to one of UL-DL configurations #1 to #6, the method comprising: receiving (S1704), by the UE, a downlink control information, DCI, format comprising resource allocation information and a downlink assignment index, DAI, field, for the secondary cell; receiving (S502_0∼M-1), by the UE, a physical downlink shared channel, PDSCH, indicated by the resource allocation information of the DCI format through the secondary cell; and transmitting (S504, S1706), by the UE, hybrid automatic repeat request, HARQ,-acknowledgement, ACK, information including one or more HARQ-ACK bits, o 0 ,o 1 ,...,o N-1 , for the secondary cell, wherein N represents the number of HARQ-ACK bits for the secondary cell, wherein: if a carrier indicator field, CIF, is not present in the DCI format, a HARQ-ACK bit related to the PDSCH is placed at o i among o 0 ,o 1 ,...,o N-1 , wherein i depends on a value of the DAI field, if the CIF is present in the DCI format, the HARQ-ACK bit related to the PDSCH is placed at o 0 among o 0 ,o 1 ,...,o N-1 , and wherein subframe configurations according to the UL-DL configurations #0 to #6 are shown in the following table 1: Table 1 UL-DL Configuration Subframe Number 0 1 2 3 4 5 6 7 8 9 0 D S U U U D S U U U 1 D S U U D D S U U D 2 D S U D D D S U D D 3 D S U U U D D D D D 4 D S U U D D D D D D 5 D S U D D D D D D D 6 D S U U U D S U U D where, D denotes a DL subframe, U denotes a UL subframe, and S denotes a special sub frame. receiving (S1704), by the UE, a downlink control information, DCI, format comprising resource allocation information and a downlink assignment index, DAI, field, for the secondary cell; receiving (S502_0∼M-1), by the UE, a physical downlink shared channel, PDSCH, indicated by the resource allocation information of the DCI format through the secondary cell; and transmitting (S504, S1706), by the UE, hybrid automatic repeat request, HARQ,-acknowledgement, ACK, information including one or more HARQ-ACK bits, o 0 ,o 1 ,...,o N-1 , for the secondary cell, wherein N represents the number of HARQ-ACK bits for the secondary cell, wherein: if a carrier indicator field, CIF, is not present in the DCI format, a HARQ-ACK bit related to the PDSCH is placed at o i among o 0 ,o 1 ,...,o N-1 , wherein i depends on a value of the DAI field, if the CIF is present in the DCI format, the HARQ-ACK bit related to the PDSCH is placed at o 0 among o 0 ,o 1 ,...,o N-1 , and if a carrier indicator field, CIF, is not present in the DCI format, a HARQ-ACK bit related to the PDSCH is placed at o i among o 0 ,o 1 ,...,o N-1 , wherein i depends on a value of the DAI field, if the CIF is present in the DCI format, the HARQ-ACK bit related to the PDSCH is placed at o 0 among o 0 ,o 1 ,...,o N-1 , and wherein subframe configurations according to the UL-DL configurations #0 to #6 are shown in the following table 1: Table 1 UL-DL Configuration Subframe Number 0 1 2 3 4 5 6 7 8 9 0 D S U U U D S U U U 1 D S U U D D S U U D 2 D S U D D D S U D D 3 D S U U U D D D D D 4 D S U U D D D D D D 5 D S U D D D D D D D 6 D S U U U D S U U D where, D denotes a DL subframe, U denotes a UL subframe, and S denotes a special sub frame. <EOS>