An apparatus for correcting error of data can improve recovery performance of an original signal by performing deinterleaving data considering channel state information. In the apparatus for correcting error of data, which corrects error of I and Q symbols equalized by an equalizer that extracts channel state information from data including the I and Q symbols transmitted through a multi-channel so as to compensate transmission distortion of the data, the apparatus includes a soft decision block performing soft decision of the I and Q signals equalized by the equalizer and the I and Q symbols from the channel state information and adding a weighted value corresponding to the channel state information to the I and Q symbols made by soft decision, a bit interleaver performing deinterleaving of the data including the I and Q symbols added with the weighted value, and a trellis decoder performing error correction of the data deinterleaved by the bit deinterleaver so as to decode the data to the original signal. |