To provide an ordering and selling system using a telephone which, in telephone shopping, simplifies a buyer's purchasing procedures and a seller's selling procedures of a product or the like.

In the ordering and selling system using a telephone whereby a buying party and a selling party of a product place an order and take and execute the order respectively through a telephone and a telephone network, the selling party assigns a different subscriber's phone number for each product in advance and the buying party specifies a product by dialing the subscriber's phone number. The selling party then executes the sale of the product specified by the dialing. When the buying party specifies the product by dialing, the selling party procures a subscriber's number of the buying party by means of a number display function of the telephone network.