Abstract: A product code analysis system, which reads a classification dictionary database which links and stores keywords in each level which configures a hierarchical structure with unit columns which are where each product name is stored. It provisionally classifies and registers product names of each inputted record according to rates of appearance of the classification name keywords with respect to each record; reads a product name dictionary database which stores product name keywords associated with each unit column; and registers in the unit columns the product names of each record according to the rates of appearance of the product name keywords with respect to each provisionally registered record. When computing the rate of appearance of the keywords in the provisional classifications and the product name registrations, the product code analysis system defines the order of handling the dictionaries and keywords, and combination of keywords and the order of handling keywords.