A data processing apparatus includes a data conversion unit for converting a plurality of sequentially input data into transfer data and sequentially transferring the transfer data, arranging the input data in each conversion unit using one transfer data as one transfer unit and a prescribed number of transfer units as one conversion unit, and the data conversion unit includes a first bit division unit for dividing the input data into first and second divided data, a bit comparison unit for comparing first divided data of an n-th time (n is a natural number equal to or more than 1) and an (n+1)-th time, a bit determination unit for determining whether the first divided data is to be inverted based on the determination result to output inversion information, a first bit inversion unit for outputting data selected based on the inversion information, and a first bit coupling unit.