1. A CRC generator polynomial select method for selecting a generator polynomial to be used in CRC coding processing and/or CRC processing of inspecting a CRC processing result, said CRC generator polynomial select method comprising: a first process of finding largest minimum Hamming distances Max.d min each defined as a largest value of a minimum Hamming distance d min between codes with a code length n equal to the sum of the length k of an information word and the length r of a parity-bit string added to said information word; a second process of finding code lengths n for each of said largest minimum Hamming distances Max.d min and determining a range expressed by relations n min (r, Max.d min )≦n≦n max (r, Max.d min ) as the range of said code lengths where notations n min (r, Max.d min ) and n max (r, Max.d min ) respectively denote the upper and lower limits of said range; a third process of searching all generator polynomials G(x) for specific generator polynomials G(x) each satisfying a condition of d min =Max.d min , which demands that that said minimum Hamming distance d min between codes be typically equal to said largest minimum Hamming distance Max.d min , in said range expressed by said relations n min (r, Max.d min )≦n≦n max (r, Max.d min ) as a range of said code lengths n found for said largest minimum Hamming distance Max.d min ; and a fourth process of selecting final generator polynomials G(x) each having a smallest term count w and a lowest code undetected-error probability P ud from said specific generator polynomials G(x).