To allow users to use the contents of the instruction manual and the guarantee of a product as reference information for the purchase of the product and also to browse them after purchasing the product by making it possible to use them as a data base, and to make it be charged for the browse of product information at need.

With a home electronics manufacturer 1, the support center 2, a store 3, the database center 4, and a user 5 mutually connected using a communications network, the user 5 can browse the product information including the contents of the instruction manual and the guarantee of the product which are registered into the database center 4 before and after the purchase of the product. Moreover, the user or the support center, at least when browsing the product information after purchasing the product, are made to be charged for the browse at need.