To provide a transaction supporting system capable of reducing a transaction fee.

This transaction supporting system is provided with a money remitting job detecting part 1 for accepting a request for remittance to a provider 30, an individual data base 2 for storing the individual information on a consumer and a provider, a money reception notifying part 3 for notifying money reception from the consumer to the provider, a reception confirming part 5 for allowing the consumer to input the reception confirmation of merchandise, a price remitting part 6 for remitting the price of the merchandise to the provider, a transaction information notifying part 7 for notifying transaction information based on the transaction history data base to a transportation trader 40, a money receiving and paying part 8 for receiving and paying money with the transportation trader, and an operational funds managing part 9 for managing operational funds. The transaction information notifying part notifies the plural transaction information to the transportation trader in a batch, and the money receiving and paying part receives a prescribed transaction fee corresponding to the notification of the transaction information from the transportation trader.