A method for transmitting Uplink Control Information, UCI, having a large payload size in a wireless access system, the method comprising: obtaining a number of first Resource Elements, REs, allocated to a Channel Quality Indicator, CQI, information to be included in the UCI; obtaining a number of second REs allocated to a Rank Indicator, RI, information to be included in the UCI; obtaining a coding rate of data transmitted along with the UCI according to the number of the first REs and the number of the second REs; obtaining a number of third REs allocated to the UCI based on the coding rate of the data; and transmitting the UCI to a Base Station, BS, by multiplexing the UCI into a Physical Uplink Shared CHannel, PUSCH, based on the number of the third REs, wherein when the coding rate of the data is obtained, a number of fourth REs allocated to an ACKnowledgement/Negative ACKnowledgement, ACK/NACK, information to be included in the UCI is not considered, and wherein the number of the first REs is calculated by O + L ⋅ M sc PUSCH _ initial ⋅ N Symb PUSCH _ initial − Q ′ RI ⋅ β offset CQI ∑ r = 0 C − 1 K r + O + L ⋅ β offset CQI, where: - O is a number of CQI bits, - L is a number of Cyclic Redundancy Check, CRC, bits added to the CQI bits, - M sc PUSCH − initial is a number of subcarriers in an initial PUSCH transmission subframe, - N symb PUSCH − initial is a number of Single Carrier frequency Division Multiple Access, SC-FDMA, symbols in the initial PUSCH transmission subframe, - Q RI ′ is a number of RI code symbols, - β offset CQI is a first beta offset determined according to a number of transmission codewords for transmission blocks, - C is a total number of code blocks, CBs, - K r is a size of each of the CBs, and - r is a code block number. obtaining a number of first Resource Elements, REs, allocated to a Channel Quality Indicator, CQI, information to be included in the UCI; obtaining a number of second REs allocated to a Rank Indicator, RI, information to be included in the UCI; obtaining a coding rate of data transmitted along with the UCI according to the number of the first REs and the number of the second REs; obtaining a number of third REs allocated to the UCI based on the coding rate of the data; and transmitting the UCI to a Base Station, BS, by multiplexing the UCI into a Physical Uplink Shared CHannel, PUSCH, based on the number of the third REs, wherein when the coding rate of the data is obtained, a number of fourth REs allocated to an ACKnowledgement/Negative ACKnowledgement, ACK/NACK, information to be included in the UCI is not considered, and wherein the number of the first REs is calculated by O + L ⋅ M sc PUSCH _ initial ⋅ N Symb PUSCH _ initial − Q ′ RI ⋅ β offset CQI ∑ r = 0 C − 1 K r + O + L ⋅ β offset CQI, where: - O is a number of CQI bits, - L is a number of Cyclic Redundancy Check, CRC, bits added to the CQI bits, - M sc PUSCH − initial is a number of subcarriers in an initial PUSCH transmission subframe, - N symb PUSCH − initial is a number of Single Carrier frequency Division Multiple Access, SC-FDMA, symbols in the initial PUSCH transmission subframe, - Q RI ′ is a number of RI code symbols, - β offset CQI is a first beta offset determined according to a number of transmission codewords for transmission blocks, - C is a total number of code blocks, CBs, - K r is a size of each of the CBs, and - r is a code block number. - O is a number of CQI bits, - L is a number of Cyclic Redundancy Check, CRC, bits added to the CQI bits, - M sc PUSCH − initial is a number of subcarriers in an initial PUSCH transmission subframe, - N symb PUSCH − initial is a number of Single Carrier frequency Division Multiple Access, SC-FDMA, symbols in the initial PUSCH transmission subframe, - Q RI ′ is a number of RI code symbols, - β offset CQI is a first beta offset determined according to a number of transmission codewords for transmission blocks, - C is a total number of code blocks, CBs, - K r is a size of each of the CBs, and - r is a code block number.