In spite of continuous stagflation, Daiso has continuously grown through the enhancement of cost to benefit ratio, based on uniform prices and product diversity. The launch of new Daiso stores becomes a social issue, as it is regarded as a competition structure with the local or existing businesses of the local economy. Meanwhile, tenants of new buildings make enormous efforts to attract Daiso stores. Such conflicting concern and expectation arise from the fact that Daiso has both competition effect and customer attraction effect. Therefore, an objective assessment on Daiso’s positive and negative effects is needed. Basis of big data from credit card analysed the sales of local stores and behavioral changes of customers, carried out the questionnaire survey simultaneously to support them. As a result of the analysis, Daiso exhibits customer who made sales amount over 50% attraction effect and also trickle down effect by which Daiso customers use the surrounding stores as well. To examine the effects of Daiso on trade area and surrounding stores, this study measures Daiso’s trade area scope proactively is 1.5km. Daiso invigorates trade area through customer attraction effect, and consolidates the internal consumption of customers within the trade area. In the analysis of the surrounding local stores, the sales of restaurants and convenience stores in complementary relations with Daiso increase, and thus Daiso has a positive effect on the stores in complementary relations. In addition, the sales of stationery stores with competition relations with Daiso increase, and the sales of some daily necessity only some stores show a weak negative effect. Therefore, the launch of Daiso stores has a bigger customer attraction effect than competition effect. Lastly, as a result of the analysis on the relations with supermarkets selling the same type of products as Daiso, but mainly selling different brand products, a positive effect is shown by Daiso’s customer attraction effect due to the attraction of new customers. .