PROBLEM TO BE SOLVED: To store state information for a duration of conversation and to provide it for entire services by identifying all of the links which are included in an output from a service, recursively incorporating state information into identified links and communicating an output to a client in response to them. SOLUTION: A client 450 accesses a home page which exists on a server 410', starts to browse a product catalog and continues to browse a catalog merchandise by selecting a hyperlink from an online product catalog. When the client 450 accesses a system for the first time, he selects a user's ID and a password and offers some additional and optional information to the server 410'. A switching program 416 incorporates the user's ID and a session ID into a conversation, while a user shows an additional product, adds an additional item to a purchase list and commits the purchase. Then he can show and update database information 475, and the state information is stored.
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