The document management device manages documents circulated to a reader according to a circulation tree and additional information added to the documents by the readers. The circulation tree indicates the circulation order of a plurality of readers, and includes at least a first group and a second group. The document management device includes: document circulation unit for enabling a reader of the circulation tree to read predetermined document data; recognition unit for recognizing additional information added by the reader as electronic data; and additional information management unit for managing the additional information by associating it with document data determined for each group to which the reader belongs.