To improve job efficiency inside a ship company and between the ship company and a supplier at the time of purchasing oil for ships.

In the case that there is the ship to be replenished with the oil, an operation side 300 inputs information regarding the ship scheduled to be replenished with the oil (S31). In the case that there is lacking information, a server 100 presses the operation side 300 (S11) and the operation side 300 inputs the lacked information (S32). Since details are established by that, the server 100 reports a fuel team 200 that they are established (S12). The fuel team 200 inquires suppliers 400 (S21) by using an inquiry image (S13). The suppliers 400 bid (S41) by using a bidding image (S14). The fuel team 200 accepts the bid of the supplier 400 of the best condition (S22).