A document processing method, including: a collection step of collecting access history of a user; a document similarity computing step of computing a document similarity, which indicates similarity between documents, by one user pattern which indicates a plurality of users who have accessed one document and another user pattern which indicates a plurality of users who have accessed another document, according to the access history collected in the collection step; a keyword weight vector correction step of correcting a keyword weight vector of the one document using the document similarity computed in the document similarity computing step; and an evaluation value calculation step of calculating an evaluation value for input information for searching, based on the keyword weight vector corrected in the keyword weight vector correction step.