A document management apparatus in an embodiment is configured to manage a printer unit which erase image information obtained by printing both characteristic identification information and document information or only the document information with an erasable color material on a printing medium, and a reading unit configured to read the characteristic identification information on the printing medium to be erased by a erasing unit, comprising: an processor unit configured to manage an erasability condition of the document information on the basis of the characteristic identification information and instruct the printer unit to output new document information according to the erasability condition of the document information, the erasability condition being contained in the characteristic identification information read by the reading unit; and an interface unit performs respectively of the transmitting and receiving of information to the reading unit and the printer unit to the processor unit.