To increase a shooting processing speed.

When a command value to a turret servo part to drive a turret loaded on a platform is calculated by using a shooting computing algorithm to shoot a target, the shooting computing algorithm performs high-speed first processing to obtain a LOS azimuth necessary to follow movement of an apparent target, executes low-speed second processing to calculate an expectation angle low in a change amount, and outputs a value obtained by adding the LOS azimuth and the expectation angle, as a command value.