Method and apparatus for mapping symbol in a communication system using low density parity check code

PURPOSE: A method and an apparatus for mapping signal in a communication system are provided to maximize the performance of code-words based on various low density parity check code(LDPC) by performing a flexible interleaving and a mapping processes. CONSTITUTION: A controller(930) arranges LDPC code-word bits according to the orders of bits. The controller establishes a transfer section. The controller transmits a transfer value to an interleaver(950) and a signal constellation mapper(970). The interleaver rearranges the LDPC codeword bits by moving the transfer zone as much as the transfer value. The signal constellation mapper maps the LDPC codeword bits.