In a mobile communication system, a coding apparatus receives 5 information bits and generates a code symbol stream comprised of 20 coded symbols. The coding apparatus generates 5 coded symbol streams having a length 32 by encoding the 5 individual information bits with different Walsh codes having a length 32, and generates a coded symbol stream comprised of 32 coded symbols by XORing the 5 coded symbol streams in a symbol unit. Further, the coding apparatus generates a code symbol stream comprised of 20 coded symbols by puncturing 2nd, 4th, 5th, 6th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, and 30th coded symbols among the 32 coded symbols.