Abstract: The present invention relates to an electronic commerce system of a group-driven purchase broker type and a shopping mail operating system, wherein buyers can jointly purchase merchandise at a price lower than a regular price through a purchase broker group who negotiates prices with sellers, and sellers can make more profits owing to the increase of sales amount since a buyer does not individually purchase merchandise, but a plurality of buyers collectively purchase merchandise through the purchase broker group even though the sellers sell merchandise at a reduced price lower than the regular price. The electronic commerce system of the present invention comprises a shopping mall operating company; a sales client; a group client connected to the shopping mall operating company; a purchase client; and a wired/wireless communication network for connecting the shopping mall operating company, the sales client, the group client and the purchase client with one another.