A method for supporting Interference Alignment (IA) in a wireless communication system includes multiplying a plurality of input symbols by precoding vectors for Interference Alignment (IA) to generate a plurality of signal vectors, mapping the signal vectors to subcarriers having unequal spacings to perform Inverse Fast Fourier Transform (IFFT), in which each signal element of the signal vector is mapped to two subcarriers among the subcarriers, converting the IFFT-transformed signal into a wireless signal and transmitting the wireless signal from a first transmitter to a receiver, and transmitting, to the receiver, information regarding precoding vectors used in the first transmitter and in second and third transmitters that communicate using the same frequency resource as the first transmitter for the IA.