The present invention relates to a device, a system, and a method for determining the credit rating of a financial trade. According to the present invention, a control method for the system for determining the credit rating of a financial trade includes: a step in which a telecommunication company server produces communication behavior information on a predetermined client using at least one among accumulation information related to a call opponent of the predetermined client joining a communications service, accumulation information related to an application usage behavior of the predetermined client, and accumulation information related to usage of a mobile client center of the predetermined client; and a step in which a financial company server determines the credit rating of a financial trade by applying the communication behavior information on a financial company server client corresponding to the predetermined client joining the communications service. The purpose of the present invention is to provide the device, the system, and the method for determining the credit rating of the financial trade of clients based on various information as well as a financial trade behavior.;COPYRIGHT KIPO 2018
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