the present invention provides a document management device including a file receiving device for receiving a document ; an optical identification device for performing optical identification on a non - textural content in the received document ; a feature mark identifier for setting up a feature mark for the document ; and a database for storing the document , which can be output from the database directly or through the file receiving device . the present invention also discloses a document management method . the device and method of the present invention have functions of identification , classification , search , and save .