A document management apparatus and a document management system that selects the document which are best to digitize from among document being used in an office, and set the priority for digitization of each document are provided. The document management apparatus comprising: an accumulator apparatus that stores, the document ID, used place and used time for a document that is used; a computing part that analyzes information stored in accumulator apparatus, and for each document, computes the usability of the document data to be digitized; a specifying part that specifies document that correspond to document data for which the usability is relatively high by comparing it to the usability already computed for the data for each document; and output part that outputs the specified result to client.