1. A document management apparatus designating a desired document in a series of documents managed under a DMA document object model and making a connection to a desired node in a hierarchical tree-structure of the desired document, the document management apparatus comprising: a document call request accepting device configured to accept a document call request for the desired document, that is made by a requesting device by presenting a document ID designating the desired document and specifying the desired node, the document ID including a character string indicating a location of the desired document and character strings designating respective nodes in the hierarchical tree-structure of the desired document; a connecting device configured to make connections to nodes in the hierarchical tree-structure of the desired document, that are designated by the document ID, sequentially from an upper level one to a lower level one; and a returning device configured to obtain, when a connection to the desired node specified by the document ID has been made, predetermined information relating to the desired node, and to return the predetermined information relating to the desired node to the requesting device making the document call request.