| 摘要 |
A representative one of a plurality of POS terminals is provided with a center PLU file and a local PLU file, and each of the POS terminals is provided with a local PLU buffer which holds a copy of the local PLU file. The local PLU file contains merchandise codes, merchandise names and unit pricces of well-selling merchandise. The center PLU file contains information on other merchandise. When merchandise is sold at one of the POS terminals, the number of sales of the merchandise is stored. After the store is closed, the stored numbers of times of merchandise are read, and if the number of times of sales of the merchandise whose information is stored in the center PLU file is smaller than that of merchandise whose information is stored in the local PLU file, the merchandise information are exchanged between the center PLU file and the local PLU file.
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