DATA TRANSFER APPARATUS, DATA TRANSMISSION/RECEPTION APPARATUS, DATA EXCHANGE SYSTEM, DATA TRANSFER METHOD, DATA TRANSFER PROGRAM, DATA TRANSMISSION/RECEPTION PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM CONTAINING PROGRAM

摘要

A data transfer apparatus (120) comprises message data reception means (121) for receiving message data from a transmission-side data transmission/reception apparatus (110), external condition fetch means (123) for fetching information related to an external condition at the moment when the message data is received, additional data fetch means (125) for deciding and fetching additional data as additional information from the message data received by the message data reception means (121) and the information related to the external condition fetched by the external condition fetch means (123), and message data transmission means (126) for adding the fetched additional data to the received message data and transmitting it to a reception-side data transmission/reception apparatus (110).