To make it easy to structure a proposition type site using attribute information, etc., in an existent customer information database that a telephone communication trader, etc., previously has by performing user authentication, regulation state confirmation, etc., using the customer information database.

This method has a request reception step (S302) for receiving a request for a hosting service from a user terminal, an authentication request step (S304) for requesting the customer information database to authenticate the user terminal, an authentication result reception step (S308) for receiving an authentication result from the customer information database, an attribute information request step (S312) for requesting attribute information on the user from the customer information database, an attribute information reception step (S314) for receiving the attribute information on the user from the customer information database, and an HTML document selection step (S316) for selecting an HTML document corresponding to the attribute information on the user received at the attribute information reception step.