TRANSMITTING/RECEIVING DEVICE, OVERLAY NETWORK CONSTRUCTION METHOD, MATERIAL FILE RETRIEVAL METHOD AND MATERIAL FILE TRANSMISSION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a transmitting/receiving device capable of concealing IP connection by effectively utilizing an empty communication line.SOLUTION: A transmitting/receiving device 10 includes: network construction means 62 of constructing an overlay network between itself and the other adjacent transmitting/receiving device 10; file retrieval means 64 of transmitting a QUERY message to the other transmitting/receiving device 10 via the overlay network; and file exchange means 66 in which, when a QUERY-HIT message is received, an untransmitted material file is received from the other transmitting/receiving device 10 and written in an internal storage 50.SELECTED DRAWING: Figure 2