To provide a capital-saving sea food electronic transaction system for surely allowing the electronic purchase at a proper price in accordance with a market price without having an auction each time by daily coming to a market in the early morning, reducing an operation cost, and causing no error and mischief even in transactions.

A market price adaptive system adopts a processing means for passing through a process of waiting for order reception by notifying a selling menu in a home page of a sponsor by temporarily predetermining a selling price of advance sale on the basis of information on various sea food commodities expected to arrive in the transaction day obtained from a wholesaler, a process of delivering the sea food commodities to respective members by transmitting an order from a customer member written in the home page to the wholesaler and a delivery dealer by making a calculation by a table, and a process of adjusting and processing an adjusted rebate amount in the proper day by calculating the adjusted rebate amount with respective members when an actual market price becomes less than a temporarily determined selling price of the delivered sea food commodities.

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