The present invention provides a system for supporting a tariff code selection. The system comprises a database for storing commodity codes for the commodities in association with tariff codes used in an importing country, said database being searched using the commodity code as a key. Tariff code selection tables are included in the database for storing tariff items hierarchically classified in accordance with the attributes thereof. The system is programmed to search a record of a commodity code similar to the commodity code of the search key when said search key resulted in no hits The tariff code selection table including the record of the similar commodity code is displayed on a display device.