1. A method for intermediating a transaction in a transaction center intermediating a transaction between a customer buying a product and a retailer selling the product through a network, said method comprising the steps of: (a) providing information concerning the product for said customer; (b) receiving information showing the product selected by the customer to buy and providing a delivery schedule including a delivery date of the product; and (c) receiving an order from the customer and providing information concerning the order to the retailer.