A document processing system includes: a document management server that manages document data and an access key to access to the document data in association with each other; and an information processing unit including: a processing section; and a display detachably linked to the processing section by one of wired and wireless connection, the display holding an image of a document, the display storing the access key to access to the document data, the processing section comprising: a connection section to which the display is linked so as to read the access key from the display; a document acquisition section that acquires the document data corresponding to the access key read from the display from the document management server; and a document processing section that processes the document data acquired from the document management server.