The present invention relates to a method and a system for cross-selling products, and the method by which: first product information provided by a product provider is provided to a retailer; a product cost and a sales commission are respectively paid to the first product provider and the retailer and second product information provided by the retailer is provided to the first product provider when a first product mapped to the first product information is sold through the retailer; a product cost and a sales commission can be respectively paid to the retailer and the first product provider when a second product mapped to the second product information is sold through the first product provider.