To provide a method for universally diagnosing specifications of a golf club set suited to a golf club set user on the basis of his personality by using scientifically analyzed and rearranged data.

Data on the figure, physical power, technical level and swing characteristics of a golf club user are inputted to a golf club set diagnostic and order receiving device 4. The golf club set diagnostic and order receiving device 4 diagnoses specifications of a golf club set consisting of golf clubs of a plurality of club numbers suited to the personality of the user by specifying specification data of golf club heads, club shafts and grips on the basis of the data inputted and outputs the result. Subsequently, a prescribed combination of modules suitable to the personality of the user from standardized data of a plurality of modules (standard parts of heads, shafts and grips, respectively) forming a prescribed golf club set previously prepared is selected and specified on the basis of the result of diagnosis.