To significantly reduce the labor of input operation in generating a plurality of storage regions, and to simply notifying generation of the storage region, for a storage device equipped in an electronic apparatus such as an image forming apparatus.

This document management device includes: a data storage means (30) for storing predetermined data; a user information storage means (31) for storing a plurality of user information for identifying a user; a user information group formation means 410 for forming a user information group including a part or whole of user information of the user information storage means (31); and a storage region creation means 412 for creating a storage region in the data storage means (30) by defining a user corresponding to each user information of the user information group formed by the user information group formation means 410 as an owner.