5. The document classification and inspection method according to claim 4 , further comprising: calculating a moving average of the scores to calculate a short period moving average and a long period moving average of the scores; and calculating a difference moving average of the scores from the short period moving average and the long period moving average of the scores to detect the time-series score change.
4. A document classification and inspection method for obtaining digital information recorded in a plurality of computers or servers, analyzing document information configured by a plurality of documents, included in the obtained digital information, and assigning a classification code indicating the degree of relevance with an inspection matter to a document to make easy use of the inspection matter to inspect the degree of relevance between the inspection matter and the document, the method causing a computer to execute a process comprising: extracting a document from a document information, and calculating, with respect to the extracted document, a score indicating the strength of connection of the document and a classification code in a time-series manner; detecting a time-series score change from the calculated score; and inspecting the degree of relevance between the inspection matter and the extracted document from the detected time-series score change.