To prevent the deterioration in the amount of communicating information or the delay of communicating time even when a plurality of missiles are coming flying by a method wherein a weapon control device is provided with a phased array receiving antenna and a phased array transmitting antenna.

A weapon control device is provided with a phased array receiving antenna, receiving a communication wave from a moving body by forming a single antenna beam electronically and using the same for scanning, and a phased array transmitting antenna 16 for transmitting a communication wave to the moving body. In this case, a control signal is outputted by a second beam controller 17 to the phased array receiving antenna 15 so as to irradiate the beam while following the movement of the moving body or the transmitting base of the communication wave and, at the same time, another control signal is outputted to the phased array transmitting antenna 16 so as to irradiate the beam while following the movement of the moving body or the transmitting base of the communication wave.