PURPOSE : A system for supplying reverse points by a mobile communication company and a method thereof are provided to enable a service subscriber to receive a benefit of service points maximally according as the subscriber uses a mobile communication network and enable an affiliated mobile communication company to attract a regular customer through an investment and returning the service points to the service subscriber as reverse points.CONSTITUTION : A mobile communication company(20) transmits predetermined registration information to a service supplying device(10) and performs a member company registration(ST1). A service subscriber joins as a member for receiving a service(ST2, ST3). If the service subscriber joins to a mobile communication network of the mobile communication company(20) and receives a service(ST4), the company(20) endows a predetermined service point with respect to a usage of the communication network to the service subscriber(ST5). The company(20) transmits predetermined point including the calculated service points to the device(10) and transfers a point to a bankbook of the device(10, ST6). The device(10) adds service points which are supplied for each service subscriber from the company(20), creates a predetermined point pool, and performs an investment process such as an investment in stocks, a real estate, an investment for an inauguration of an enterprise, etc. using an amount of money corresponded to the point pool(ST7). The device(10) calculates reverse points according to each service subscriber with respect to earnings of the investment after the investment is terminated using the point pool(ST8). The device(10) transmits the reverse point to the company(20, ST9). The device(10) supplies the reverse point to the service subscriber using connection information of the subscriber(ST10).? KIPO 2003