PURPOSE: To enable plural ground control stations to control individual equipments mounted on a satellite through only one private circuit to communicate with individual equipments by using time division channels and separating each time division channel into a communication data part and a control data part.

CONSTITUTION: Data transmitted from a ground control station is distributed to plural equipments 3, 4 mounted on the satellite in accordance with the channel numbers of the time dividing channels by a satellite-mounted time division channel receiving part 1 through a common bus 2. The data are inputted to a receiving circuit 51 in each equipment mounted in the satellite, an assigned time division channel is detected and necessary receiving data are discriminated and outputted to an error detecting circuit 52. When an error is not detected by the circuit 52, the receiving data are inputted to a data separating circuit 53 and separated into a communication data part and a control data part, which are respectively stored in a communication data storing circuit 54 and a control data storing circuit 55. A processor 57 can reads out the receiving data through the circuit 54. Consequently, plural ground control station can control individual equipments mounted on the satellite through only one private circuit to attain individual communication.