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Mining is to dig out mineral. The meaning shifting, Data-mining means the technique or method to discover the mutual relation and the pattern between the terms, to find out the tendency to something from massive data that is stored in enterprise, such as the selling-data of retail stores and consumer's past record of using credit-card. To practice effectively the data-mining, need the next process. The first we store data, and then extract special departmentally from their data, and find out the ordinality or the tendency which lie hid in data by using the multivariate and genetic algorithm. From these analyses, we can discover the mutual relation as" Customer buying beer often had bought paper-diaper with it". Also from past consumer's record of using credit-card, it has been thought about such an application that the distinctive patterns of their abusing just at that moment were found out.