A method for transmitting uplink control information in a wireless communication system, comprising: generating a plurality of hybrid ARQ acknowledgements, HARQ-ACKs, and the method is characterized by further comprising: selecting, from among a plurality of resource indices, one first resource index and two second resource indices corresponding to the plurality of HARQ-ACKs; transmitting, through a first antenna port, a first modulation symbol corresponding to the plurality of HARQ-ACKs and a first reference signal for demodulating the first modulation symbol; and transmitting, through a second antenna port, a second modulation symbol corresponding to the plurality of HARQ-ACKs and a second reference signal for demodulating the second modulation symbol, wherein both a transmission resource for the first modulation symbol and a transmission resource for the first reference signal are given using the first resource index, wherein a transmission resource for the second modulation symbol is given using one of the two second resource indices and a transmission resource for the second reference signal is given using the other of the two second resource indices. generating a plurality of hybrid ARQ acknowledgements, HARQ-ACKs, and the method is characterized by further comprising: selecting, from among a plurality of resource indices, one first resource index and two second resource indices corresponding to the plurality of HARQ-ACKs; transmitting, through a first antenna port, a first modulation symbol corresponding to the plurality of HARQ-ACKs and a first reference signal for demodulating the first modulation symbol; and transmitting, through a second antenna port, a second modulation symbol corresponding to the plurality of HARQ-ACKs and a second reference signal for demodulating the second modulation symbol, wherein both a transmission resource for the first modulation symbol and a transmission resource for the first reference signal are given using the first resource index, wherein a transmission resource for the second modulation symbol is given using one of the two second resource indices and a transmission resource for the second reference signal is given using the other of the two second resource indices. selecting, from among a plurality of resource indices, one first resource index and two second resource indices corresponding to the plurality of HARQ-ACKs; transmitting, through a first antenna port, a first modulation symbol corresponding to the plurality of HARQ-ACKs and a first reference signal for demodulating the first modulation symbol; and transmitting, through a second antenna port, a second modulation symbol corresponding to the plurality of HARQ-ACKs and a second reference signal for demodulating the second modulation symbol, wherein both a transmission resource for the first modulation symbol and a transmission resource for the first reference signal are given using the first resource index, wherein a transmission resource for the second modulation symbol is given using one of the two second resource indices and a transmission resource for the second reference signal is given using the other of the two second resource indices.