A document processing apparatus provided with boxes for storing various information in a sorted manner, the boxes including at least a private box having a box function of allowing an access from a specific user and/or group, includes a notification portion. The notification portion is configured such that when a document is moved in or a new document is accumulated in the private box from a user or a group other than an owner of the private box, the fact that the document is moved in or the new document is accumulated in the private box from a user or a group other than the owner of the private box is notified to the owner of the private box and that when a document not accumulated by the owner is accumulated in the private box, the fact that the document not accumulated by the owner is accumulated in the private box is also notified to the owner.