A long-range artillery intercept system is under development to counter the North Korean long-range artillery threat. Simultaneous engagement capability is very important because this system, which consists of radar, engagement control station, and missile launcher, has to deal with a large number of enemy fire rounds in a short time. In this study, we propose a command assignment method for the control center to improve the effectiveness of the long-range artillery intercept system. The proposed algorithm considers the interceptable shoot time of missiles according to the trajectory of the enemy and the possible schedule of each launcher. To verify the superiority of this algorithm, it was compared with the other two methods, distance-based and random. Experiment was executed under the assumption that that a large number of enemies were concentrated in a certain area, and the result was obtained by repeating 100 times. The results show that our method contributes not only to the excellent effectiveness but also to the efficient operation of the launchers. Each launcher fired as many missiles as possible and generated the least amount of idle time. The results of this study can be used as a reference for the long-range artillery interception system as well as other complex systems in the future.