a satellite communication system by which information of afflicted areas can be collected rapidly and accurately at the time of disaster such as an earthquake or the like , and which is easy to introduce . in the system , a center station accommodates a plurality of extensions of a private branch exchange . portable terrestrial stations are made to one - to - one correspond to the extensions accommodated in the private branch exchange and the center station connects the extensions to the corresponding portable terrestrial stations . the respective frequency bands of a communication satellite to be used for the transmission from each of the portable terrestrial stations to the center station and for the transmission from the center station of each of the portable terrestrial stations corresponding to the one extension are stationarily secured . each portable terrestrial station is small - sized so as to be portable by a person or by a motorcycle .