A commerce system includes an EC server connecting to a user terminal and executes E-commerce, a customs clearance authentication server that administers pre-customs clearance information, and an administration server connected to the customs clearance authentication server and the EC server. The administration server receives a registration request including product information regarding a product, transmits the registration request to the customs clearance authentication server, receives pre-customs clearance information regarding the product from the customs clearance authentication server, and notifies the pre-customs clearance information to the EC server. The customs clearance authentication server generates pre-customs clearance information based on product information, in response to a request from the EC server, and transmits generated pre-customs clearance information to the administration server. The EC server transmits the received pre-customs clearance information along with product information to the user terminal, and accepts, from the user terminal, an instruction to circulate the product specified via customs.