To ensure safety of merchandise transactions utilizing a communication network.

In this merchandise transactions intermediary system 10, a plurality of seller side information devices 12 (12a to 12n), a plurality of buyer side information devices 16 (16a to 16n) and an intermediation side information processing part 18 are connected to a communication network 14. Sellers register the sales information of merchandise desired to be sold in the server 22 of the part 18 via the devices 12. Buyers select desired merchandise from the sales information displayed on the devices 16 and place an order. When a buyer places an order, an intermediation side information device 20 transfers a merchandise purchase price from the account of a financial institution 30 designated by the buyer to the account of a depository 26 and requests a physical distribution company 28 storing the merchandise of the seller or the buyer to transmit the merchandise.