A product sales assist system suitable for reducing development cost is provided.A coordinated EC site server (100) inputs a user's work, registers the input work in a work management table (460) in association with a user ID of a user related to the work, causes a terminal of the user to display a work corresponding to a user ID of another user among works in the work management table (460), selects a work from among the works in the work management table (460) in accordance with a request from the terminal of the user displaying the work, sends a request for registration of a product to which the selected work is applied to a major EC site server (120) together with product information including the work, and requests the major EC site server (120) to perform a settlement process in accordance with a request from the terminal of the user related to the work selection request.
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