When observing the moon and satellite from the input earth point, the function (positioning, communication, flash) is assigned to the satellite according to the relative position of the satellite to the moon, and the moon revolves around the earth. A lunar orbiting satellite system that performs orbit planning for correcting the relative position that changes according to the period is obtained. According to the relative position of the artificial satellite with respect to the moon when observing the artificial moon and the artificial satellite from a point of the earth input with respect to a plurality of artificial satellites constituting a group of artificial satellites flying around the moon A satellite orbit planning unit that assigns a function to an artificial satellite and sets a target orbit in accordance with the function, and a satellite control unit that causes the artificial satellite to execute control based on the function and realizes switching of the function. .
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