To resolve the problem that the fact that authentication of users is very important for an ASP system which is accessible from any place through the Internet though the ASP system is a useful means allowing an application program and a database to be shared within a group, but an existing authentication system is inevitably high-cost because a server only for authentication, high network technologies, etc., are required, thereby making it difficult to spread the APS system, due to costs and human power, regardless of social needs of the APS system.

In order to resolve problems of cost, human beings, and security to enable even a small-scale enterpriser to utilize a high-level authentication system, a required system can be constructed and utilized without requiring a server only for authentication, special technologies, etc., by only installing an ASP secure menu system including an authentication system into an application server of the ASP system like installation of software on the market.