Abstract: The invention relates to an electronic commerce system that permits a customer to place an order or request various services, such as respond to a complaint or inquiry, to a seller through a sales information coordinating organization without directly contacting the seller. The invention also relates to a method of electronic transaction using such a system. The invention provides an electronic commerce system which includes customers' terminals and a sales information coordinating organization connected to the system through a network. Each customer's terminal is provided with a system to request provided information to specify a seller or sellers, items and their prices to be provided by the seller(s). A system to input customer information and order information that serves to specify a transaction item or transaction items, along with a system to transmit customer information and order information to the sales information coordinating organization facilitates communication.