An electronic commerce method and system using an Internet Protocol Television (IPTV) and a mobile terminal are provided. In an electronic commerce method and system, an IPTV or mobile terminal transmits binding information to a server where a purchaser selects product information, the server determines a purchaser authority using the received binding information, and transmits sales information for the selected product information to the mobile terminal in response to the purchase authority being valid, and the mobile terminal makes an offer to purchase the product to the server using the received sales information.