9. The system according to claim 8 , wherein, when a plurality of the utterance phrases are proposed, the utterance section proposes the utterance phrases one by one in sequence.
8. A conversation based search system, functioning as a search engine, for searching the internet from a user terminal, comprising: an utterance section configured to extract a keyword from an initial query input into a search window by a user through the user terminal, wherein the search system is configured to search the internet for documents, wherein the documents are comprised of websites, web data and databases, and to propose at least one predetermined utterance phrase corresponding to the initial query, based on the extracted keyword, wherein the predetermined utterance phrase has been selected from a database that includes a plurality of keywords stored therein, with each of said keywords being associated, in the database, with at least one utterance phrase; and wherein the utterance section is configured to present the utterance phrase associated with the extracted keyword to the user via the user terminal into the search window, and further wherein the utterance section is also configured to receive an answer to the presented utterance phrase from the user by a touch on a touch-detection surface separated from the search window; a search section configured to reform the initial query based on the answer of the user to the utterance phrase that was proposed to the user by the search system, provide the reformed query to the search window, search the internet based on the reformed query, and offer a search result to the user via the user terminal, where the search result corresponds to the search based on the reformed query, wherein the search result includes a listing of a plurality of websites, wherein searching the internet based on the reformed query is performed after receiving the user's answer to a final utterance phrase presented to the user, without conducting a search of the internet based on the initial query, and wherein the reformed query is always made from the answer from the user to the utterance phrase in combination with at least one of the keywords contained in the initial query.