A system for a product demand/supply connection network service based on tariff-harmonized commodity description codes, and a method for the same are provided. The method comprises: receiving a list of commodities based on tariff-harmonized commodity description codes from a trade information providing device via a communication network; classifying the received list of commodities into datasets on the basis of HS codes; generating the commodity list classified into the datasets as a hierarchical structure of a forward-oriented or reverse-oriented demand/supply connection network; and providing trade volume information of import and export related products, providing chemical abstract service (CAS) numbers, technical patent numbers, and product restriction information, or providing a list of commodities for each trade partner and each trade region on the basis of the hierarchical structure of the forward-oriented or reverse-oriented demand/supply connection network.