2. The document management system according to claim 1 , wherein the document destruction apparatus requests an establishment of communication to the document management apparatus with a predetermined timing; and the mode selection unit selects one of the destruction modes according to whether the document destruction apparatus succeeds in establishing communication with the document management apparatus.
2. The document management system according to claim 1 , wherein the document destruction apparatus requests an establishment of communication to the document management apparatus with a predetermined timing; and the mode selection unit selects one of the destruction modes according to whether the document destruction apparatus succeeds in establishing communication with the document management apparatus. 4. The document management system according to claim 2 , wherein the mode selection unit selects the second destruction mode when the document destruction apparatus succeeds in establishing communication with the document management apparatus.