1. An FAQ search engine, comprising: a document of describing a search keyword; a terminal unit for acquiring the search keyword from said document and inputting the search keyword; a database which has a keyword group consisting of search keywords obtained by adding numbers to the keywords described in said document, and an FAQ data group for managing FAQ data relevant to said numbers; a number acquisition portion for acquiring said number corresponding to the provided search keyword out of said keyword group; a data extract portion for acquiring said FAQ data corresponding to the number acquired from said number acquisition portion out of said FAQ data group; and an FAQ display portion for displaying said FAQ data on said terminal unit.