| 摘要 |
PROBLEM TO BE SOLVED: To automatically suppress the duplicate selling of the same merchandise to the same trade and the same area or the like. SOLUTION: Merchandise to be purchased, user ID, and use category inputted from a person who wants to purchase the merchandise are accepted by an information accepting means 14, and a sales record data base 12 in which a plurality of sales records constituted of purchased merchandise, the user ID of a purchaser, and the user category of the purchaser are stored is retrieved, and whether or not the purchaser whose use category is the same as that of the person who wants to purchase merchandise is already present in the purchasers who have already purchased the merchandise to be purchased is judged by a retrieving and judging means 15, and when it is judged that any purchaser whose use category is the same is not present, a selling validity notifying means 16 notifies a selling system 1 of the validity of selling, and in the other case, a selling invalidity notifying means 17 notifies the selling system 1 of the invalidity of selling. Thus, it is not necessary to ask any person to judge whether the selling is valid or invalid. |
