Subscriber software version confirmation system and automatic software upgrade system thereby in multimedia satellite communication system

PURPOSE: A subscriber software version confirmation system and an automatic software upgrade system thereby in the multimedia satellite communication system are provided to upgrade automatically in case that the latest software version provided to a subscriber and a software version the subscriber holds are not in accordance. CONSTITUTION: A set top box(4) is comprised of an RF unit(41), an MPEG-2 TS receiving unit(42), a CDMA transmitting unit(43), a processor(44), a network interface card(45), and a service information unit(46). The RF unit(41) carries out frequency down conversion and low noise amplification for a high frequency signal sent from a central station. The MPEG-2 TS receiving unit(42) demodulates an MPEG-2 TS packet received from the central station. The CDMA transmitting unit(43) executes CDMA conversion and modulation for data to be transmitted to the central station. The processor(44) controls so that a data received through the MPEG-2 TS receiving unit(42) can be transmitted to a personal computer(5). The network interface card(45) executes interfacing between the set top box(4) and the personal computer(5). The service information storage unit(46) stores service information, such as software version information. The personal computer(5) is composed of a subscriber program(51), a PNM(PC Network Monitor) program(52) and a version information storage unit(53).