A channel coding method in a communication system using a Low-Density Parity-Check (LDPC) code. The channel coding method includes determining a degree distribution for a plurality of column groups of an information part and a plurality of column groups of a parity part; determining degrees for the plurality of column groups of the information part based on the degree distribution; determining a shortening order based on the degrees for the plurality of column groups of the information part; generating a parity check matrix based on the shortening order; and performing coding using the generated parity check matrix.