16. The information management system according to claim 9 , wherein the contents server is configured to: notify, at the time of discarding the paper document, in case of which the paper document is the master of the document, that discarding the paper document is inhibited; and hold in case of which the paper document is not a master of the document, that the paper document has been discarded, after the paper document has been discarded.
9. An information management system, comprising: a coordinate pointing device for identifying a paper medium; and a contents server for managing a digital document, the information management system holding an attribute of the digital document and an attribute of a paper document obtained by printing the digital document on the paper medium, wherein the contents server is configured to: judge whether a paper document identified by the coordinate pointing device is a master of a document by referring to an attribute of the paper document; and permit, when it is judged that the identified paper document is the master of the document, to update information annotated to the identified paper document in a digital document corresponding to the paper document to which the information has been annotated.