A method for transmitting feedback information by a user equipment, UE, in a wireless communication system, the method comprising: receiving (S301) a reference signal from at least one eNB among eNode Bs, eNBs, performing a coordinated multi-point, CoMP, operation; determining (S302) a first precoding matrix index, PMI, set information corresponding to the at least one eNB based on the reference signal, when the at least one eNB operates in a best companion coordinated beamforming, CB, based CoMP scheme; determining (S303, S304, S305) a phase set information based on the first PMI set information for the best companion CB based CoMP scheme, when the at least one eNB operates in a joint processing, JP, based CoMP scheme; transmitting (S306) feedback information including the first PMI set information for the best companion CB based CoMP scheme and the phase set information to a serving eNB from among the at least one eNB, wherein the feedback information is used in both the best companion CB based CoMP scheme and the JP based CoMP scheme, wherein determining the phase set information includes changing (S303) each first index of the first PMI set information into a second index for the JP based CoMP scheme based on predetermined index change calculation, determining (S304) second PMI set information for the JP based CoMP scheme based on the second index, and deriving (S305) the phase set information from the second PMI set information, and wherein the predetermined index change calculation is performed such that the second index of the second PMI set maximizes a joint probability mass function for each first index of the first PMI set, at a specific channel for the at least one eNB. receiving (S301) a reference signal from at least one eNB among eNode Bs, eNBs, performing a coordinated multi-point, CoMP, operation; determining (S302) a first precoding matrix index, PMI, set information corresponding to the at least one eNB based on the reference signal, when the at least one eNB operates in a best companion coordinated beamforming, CB, based CoMP scheme; determining (S303, S304, S305) a phase set information based on the first PMI set information for the best companion CB based CoMP scheme, when the at least one eNB operates in a joint processing, JP, based CoMP scheme; transmitting (S306) feedback information including the first PMI set information for the best companion CB based CoMP scheme and the phase set information to a serving eNB from among the at least one eNB, wherein the feedback information is used in both the best companion CB based CoMP scheme and the JP based CoMP scheme, wherein determining the phase set information includes changing (S303) each first index of the first PMI set information into a second index for the JP based CoMP scheme based on predetermined index change calculation, determining (S304) second PMI set information for the JP based CoMP scheme based on the second index, and deriving (S305) the phase set information from the second PMI set information, and wherein the predetermined index change calculation is performed such that the second index of the second PMI set maximizes a joint probability mass function for each first index of the first PMI set, at a specific channel for the at least one eNB. <EOS>