One transaction system of used laptop and its method is arranged to induce the reliable reasonable trade between businessman, by automatically determining a price appropriate according to the condition of used laptop. One client terminal (100) includes selling a seller terminal of a used laptop, and (200) provide each application to client terminal at a notebook intermediate server. Preset price cartel is determined at notebook intermediate server, the specification of used computer is inputted from seller terminal, and display is used for the appraisal of used laptop.
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