To provide a voice mail service through a mobile telephone network by performing transmission to a voice mail box in accordance with the registration of a subscriber's mobile station to a 2nd network switching node and performing the content transmission of a 1st voice mail box according to the receiving of a voice mail transfer command through a 1st voice mail storing unit.

A satellite control center SCC 8 and a tracking telemetry and controller TT/C 9 control the operations of satellites 3a and 3b, e.g. the setting of a transmission power level and transponder input tuning through an instruction from a network management center NMC 7. A telemetry signal from the satellites 3a and 3b is received by the tracking-telemetry and controller TT/C 9 and processed by the center SCC 8, so that the satellites 3a and 3b function surely and accurately. Mobile telephones UT4a and 4b communicate with the satellites 3a and 3b during speech communication.