PURPOSE: To automatically correct positions of all satellites by rotating one parabolic antenna to store positions of plural satellites and setting the position of one satellite as the reference in the case of deviation of the parabolic antenna from a mast.

CONSTITUTION: The reference position (east limit) of the rotation angle of a parabolic antenna 1 is stored in a storage part 7. An actuator 11 is driven from the reference position to direct the parabolic antenna to the first satellite. When the parabolic antenna 1 is rotated, pulses whose number corresponds to the rotation angle are generated from a pulse generating part 10. The number of pulses and the name of the set satellite are stored in the storage part 7. The actuator 11 is driven to direct the parabolic antenna 1 to the next satellite, and the position of this satellite is set in the same manner. Positions of all satellites are set in the same manner. If the parabolic antenna 1 is deviated, the actuator 11 is driven by the operation from an input part 16 to direct the parabolic antenna 1 again so that the radio wave from the first satellite can be received with the maximum sensitivity, thereby correcting the positions of all satellites.