A data processing apparatus maps input symbols to be transferred on a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed (OFDM) symbols. The data processing apparatus comprises an interleaver memory reading in a predetermined number of data symbols to be mapped on the sub-carrier signals of OFDM. The interleaver memory reads out the data symbols on the OFDM sub-carrier to realize mapping. The sequences of reading out and reading in are different and are determined by an address set so that the data symbols are interleaved on the sub-carrier signals. The address set is generated by an address generator that comprises a linear feedback shift register and a permutation circuit. The polynomial expression of the generator for the linear feedback shift register is FORMULA, and a permutation code is provided for permuting the sequence of the contents of register level. The permutation code is established by simulation analysis so as to optimize communication performance through typical wireless channels. Therefore, an interleaver is provided for 1K operation. The interleaver can interleave the data symbols onto about 1000 sub-carriers of OFDM symbols for an OFDM modulating system with the standard of Digital Video Broadcasting (DVB) such as DVB terrain 2 (DVB-T2).