Coding method and apparatus for cross cyclic code

This invention refers to a method for obtaining parity check code by coding coded word, said parity check code is set in coded word and separating it for forming at least the first and second data code element each of them forming a coefficient, the first and second data code element and parity check code respectively form the first polynomial, the second polynomial and parity check code polynomial, the other polynomial such as the first code generating polynomial, second code generating polynomial and third polynomial also can be generated by definite sequence in order to obtain said parity check code.