In a document-management device which supports a task of electronizing paper documents and registering electronic data of the documents to an existing system having a user interface provided to register electronic data, a request receiving unit receives a code assignment request from a user when a user interface screen corresponding to an electronic-data registration site of the existing system is displayed on a client. A code generating unit generates a site identifying code identifying the registration site of the existing system after the code assignment request is received. A screen generating unit generates a screen containing an image of the site identifying code, the screen provided for the user to print an automatic registration request page which is scanned simultaneously with scanning of the paper documents.