A web site 10 is provided in a communication network to enable the selective provision of appropriate information, by a site whereat only limited access is permitted, in consonance with the access right of the source of a request for information.comprises: a data management system 19; a user agent determination module 12, for ascertaining the type of a transmission source from which an access request is received; and response generation modules 15 to 18, for acquiring, from the data management system 19, information that is correlated with the type of the transmission source, and for generating and returning a response, wherein the data management system 19 stores main information 19a, for which access is limited, and metadata 19b, which is information describing the main information 19a.