To provide a system capable of appropriately proposing a search term candidate for each page of a document. Provided is a search document information storage device comprising: a vocabulary extraction means 3; a keyword storage means 5; a keyword extraction means 7; a topic term storage means 9; a topic term extraction means 11; a search term candidate extraction means 13; a search term candidate display means 17; a search term input means 19; and a document search information storage means 21.