To determine a control mode from a fluctuation value of relative position posture relation between a tracking antenna loaded on a flight vehicle and a ground antenna and mutual position relation, to generate a tracking antenna target value, and to execute tracking antenna control to an unmanned machine and the ground station which mutually move on a space.

A flight vehicle includes: flight vehicle antenna control mode determination means for generating a flight vehicle antenna control mode signal based on a flight vehicle position estimation signal and a ground station information prediction signal; and flight vehicle antenna target value generation means for generating a flight vehicle antenna target value signal based on the flight vehicle position estimation signal, the ground station information estimation signal, and the flight vehicle antenna control mode signal, and the ground station includes: ground station antenna control mode determination means for generating a ground station antenna control mode signal based on a ground station position estimation signal and a flight vehicle information prediction signal; and ground station antenna target value generation means for generating a ground station antenna target value signal based on the ground station position estimation signal, the flight vehicle information prediction signal, and the ground station antenna control mode signal.