Generating method and the check matrix of the check matrix, and decoding apparatus and decoding method

Method of generating a check matrix with coded by a low density parity check codes, a, which is a modulation symbol unit (where, a is a natural number) b (where, b is a natural number) data bit to the bit data a method of generating a check matrix to decode the coded modulation data modulated by converting (H), out of a number of elements corresponding to the data of the same modulation symbol in each row constituting the check matrix, 1 become element comprises a check matrix generating step of generating a check matrix by determining each element to be 1 or less.