Korea Multi-Purpose Satellite-2 (KOMPSAT-2) is to be launched in November of 2005, and Mission Control Element to monitor and control KOMPSAT-2 has been developed by ETRI. Satellite Operations System is one of the four subsystems of KOMPSAT-2 Mission Control Element, and the functions of SOS include telemetry reception and processing, telecommand processing and transmission, data management, system management, and trend analysis. The development of SOS was completed, the test for SOS was performed to check the functions and performance of SOS, and the system has currently installed in Korea Aerospace Research Institue (KARI) where KOMPSAT-2 mission control will be performed.