PROBLEM TO BE SOLVED: To support the simple and accurate confirmation work of goods brought into Japan from overseas at customs. SOLUTION: A customs business support device 40 is based on an acquisition unit 41 for acquiring purchase information 410 representing an overseas purchase record of a product by a target person, a purchase information 410, and a predetermined standard 420, and the domestic product. It is provided with a determination unit 42 for determining whether or not the product can be brought into the store and the content of taxation on the subject. [Selection diagram] Fig. 3
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