Decoding device and decoding method

A decoding technique capable of increasing the error correcting performance and improving the communication quality. This technique carries out error correcting decoding in code block units on a reception signal that is made up of a plurality of code blocks each with CRC-bit placed at the end; detects the position of concatenation of the code blocks subjected to error correcting decoding and divides the concatenated code blocks based on this detection result; and carries out CRC bit cyclic redundancy inspection on each code block after the division.