1. A method of reducing a number of computations in an equalization process, comprising: performing a pre-equalization operation on selected first frames from a plurality of frames; estimating pre-equalization values of second frames based on the pre-equalization values of the selected first frames, the second frames being frames which are not selected from the plurality of frames; and selecting the first frames from the plurality of frames, wherein estimating the pre-equalization values of the second frames comprises: performing one of an interpolation and an extrapolation operation on the pre-equalization values of the second frames based on the pre-equalization values of the first frames; and performing a pre-equalization operation on the second frames when the pre-equalization values of the second frames do not satisfy predetermined criteria.