Wind power prediction information is necessary for electric power system operation and electricity power market which is allowed to participate the wind power. In this study, a real-time wind power prediction system is designed for the real application for the electric power system of Smart-Grid Test Bed in Jeju island, South Korea. This study is on the first system for practicable application of wind power to the electric power system operation in South Korea. This is composed of the meteorological forecasting module, calculation module of wind power output and HMI visualization system. The final output data from this system is short-term (6hr ahead) and mid-term (48hr ahead) wind power prediction values. These values are produced by using physical and statistical model. The purpose of this study is to further improve the accuracy of this prediction system and to develop practical system for power system operation and energy market in Smart-Grid.