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.