The invention analyzes a character string and link information of a WWW page being currently browsed, infers that the said page is a page having a collection of information of a certain kind, namely, an objective field such as present information, event information or the like, and embeds into this page a function of performing a retrieval limited to the inferred objective field. A user performs a limited retrieval using the retrieval function and obtains other information of the said objective field.