In order to acquire answer information to be searched from a large amount of question information, there is provided an FAQ search engine which can acquire an appropriate term and acquire appropriate information by using the term as a search keyword. It comprises a document of describing a search keyword, a terminal unit for acquiring the search keyword from the 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 the document, and an FAQ data group for managing FAQ data relevant to the numbers, a number acquisition portion for acquiring the number corresponding to the provided search keyword out of the keyword group, a data extract portion for acquiring FAQ data corresponding to the number acquired from the number acquisition portion out of the FAQ data group, and an FAQ display portion for displaying the FAQ data on the terminal unit.