PURPOSE: A cyber shopping mall system on the Internet is provided to offer commodity information from a seller to customer by operating an individual shopping mall and a union shopping mall as an independent and integrated method. CONSTITUTION: An individual shopping mall(110) and union shopping mall(120) are connected to each other on the Internet. Shopping commodity information data(130) of the individual shopping mall(110) is shared with shopping commodity information data(140) of the union shopping mall(120). Member data(150) of the individual shopping mall(110) is shared, in order to purchase a commodity of the union shopping mall(120). Shopping commodity information data(140) of the union shopping mall(120) is a large unit of data gathering the data(130) of each individual shopping mall.
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