The document information management system according to the present invention comprises data base with a plurality of document files previously stored therein, a medium form having a document information section with document information recorded thereon and a bar code information section with electronic information corresponding to contents of the document information converted to bar code information and stored therein, a marking unit for giving a selection mark by selecting a desired word from a medium form, a reading unit for reading a selection mark and bar code information from a medium form with the selection mark given thereto, a retrieving unit for retrieving a corresponding document file from a data base using a word with a selection mark given thereto as a key word according to the selection mark and bar code information, and an output unit for outputting the retrieved document file as related information.