To provide a new spot trading system whose risk is low, and whose liquidity is high.

This spot trading method includes a host device 4 for managing the first and second spot trading of the cash spot payment and in-fixed period post-payment of brand-categorized article and a plurality of transaction terminals 11 to 14 connected through a network 10 to the host device 4, and when a transaction mediator (a) who is entrusted by a member inputs the first or second buying/selling order by the terminal 11, it is transferred to the host device 4, and the host device 4 stores it in a storage means 4A, and retrieves the set of a selling order and a buying order whose conditions are matched, and executes the order, and stores the first or second execution information with an executed brand and a cash price as a set in the storage means 4A. The host device 4 transfers the first and second spot trading execution information and the first and second spot trading buying/selling order information to each transaction terminal, and makes the terminal display it, and transfers the execution notification information to the terminal which has made the executed original order.