An apparatus in a receiver of a single carrier-frequency division multiple access, SC-FDMA, system, the apparatus being an apparatus for eliminating I/Q offset in the receiver, the apparatus comprising: a first linear interpolation channel estimation unit configured to perform channel estimation with respect to an M-point discrete Fourier transformed signal obtained by subjecting a received signal to frame sync acquisition, frequency compensation, cyclic prefix elimination and discrete Fourier transform, and to output a channel coefficient (H'), wherein the channel estimation is performed using a demodulation reference symbol, DMRS, which is a training sequence that is known in the receiver; a first signal regeneration/cancellation unit configured to receive the channel coefficient (H') and the discrete Fourier transformed signal from the linear interpolation channel estimation unit and to calculate an I/Q offset by subtracting the discrete Fourier transformed signal from an ideal discrete Fourier transformed signal (Y') created by using the channel coefficient (H') and the DMRS which is the training sequence; and a first I/Q offset measurement/cancellation unit configured to receive the I/Q offset from the signal regeneration/cancellation unit and to generate an I/Q offset-free signal (Y NoDC) by subtracting an I/Q offset (D') having corrected phase and power from the M-point discrete Fourier transformed signal, wherein the first linear interpolation channel estimation unit is configured to perform channel estimation, in order to minimize the effect of I/Q offset, on the left 1/3 of a total of M subcarriers and the right 1/3 of the total of M subcarriers using the least square method or the minimum least square error, MMSE, using the DMRS which is the training sequence, and to perform channel estimation on the remaining 1/3 of the total of M subcarriers by linearly interpolating the channel estimation results of said left 1/3 and right 1/3 of the M subcarriers. a first linear interpolation channel estimation unit configured to perform channel estimation with respect to an M-point discrete Fourier transformed signal obtained by subjecting a received signal to frame sync acquisition, frequency compensation, cyclic prefix elimination and discrete Fourier transform, and to output a channel coefficient (H'), wherein the channel estimation is performed using a demodulation reference symbol, DMRS, which is a training sequence that is known in the receiver; a first signal regeneration/cancellation unit configured to receive the channel coefficient (H') and the discrete Fourier transformed signal from the linear interpolation channel estimation unit and to calculate an I/Q offset by subtracting the discrete Fourier transformed signal from an ideal discrete Fourier transformed signal (Y') created by using the channel coefficient (H') and the DMRS which is the training sequence; and a first I/Q offset measurement/cancellation unit configured to receive the I/Q offset from the signal regeneration/cancellation unit and to generate an I/Q offset-free signal (Y NoDC) by subtracting an I/Q offset (D') having corrected phase and power from the M-point discrete Fourier transformed signal, wherein the first linear interpolation channel estimation unit is configured to perform channel estimation, in order to minimize the effect of I/Q offset, on the left 1/3 of a total of M subcarriers and the right 1/3 of the total of M subcarriers using the least square method or the minimum least square error, MMSE, using the DMRS which is the training sequence, and to perform channel estimation on the remaining 1/3 of the total of M subcarriers by linearly interpolating the channel estimation results of said left 1/3 and right 1/3 of the M subcarriers.