18. The method according to claim 17 , wherein the step for acquiring the terms in which the user has interest from the first display part further comprising the steps of: displaying a term graph of the acquired terms in the first display part; composing a new query by extracting at least one of the terms and their relevant information from the knowledge base, and submitting the query to the document database; extracting a list of relevant documents; and displaying the list of the extracted documents in the second display part.
17. The method according to claim 12 , wherein the step for acquiring the one or more terms acquires the terms in which the user has interest from the first display part.