INFORMATION TRANSMISSION SYSTEM

PROBLEM TO BE SOLVED: To reduce a communication cost and transmit even when a communication satellite is interrupted due to the effect of weather by solving such problems caused when contents or various types of data are transmitted through the communication satellite that the results of communication must be checked for all transmission data through a WAN and, accordingly, the WAN must be prepared. SOLUTION: In this system, the transmission of the contents or various types of data is performed through the communication satellite, and the results of the communication is checked through the WAN. On a transmission side, a signal on the necessity of the check is added and, only when the results of transmission must be checked, the WAN is used. If the transmission through the communication satellite fails, the necessity of re-transmission is added and, when re-transmission is required, the signal is re-transmitted through the WAN. When the updating of the contents or various types of data is not performed on a display device side as a receiving side even after a specified time is passed, a specified mark is displayed on the screen of the display device for warning.