The naval combat management system conducts a comprehensive analysis of obtained information and integrates it with on-board sensors, weapons, and other equipment. Furthermore, it automatically performs all processes such as engagement plans, weapon assignments, and target detection using already pre-deployed database information. Thus, it is important to manage moving objects from many different kinds of sensors. In this paper, we will introduce the Moving-Object management method of combat systems using the In Moving Object DBMS. This is based on the main memory database technology provided by the high speed transaction processing performance.