A method for simultaneously comparing international standard time by using a satellite-based code division technique is provided to enable all time comparison organs participating in a time comparison link to simultaneously perform multi-channel time comparison, thereby simultaneously and exactly comparing the standard time of nations, which can be covered by a communication satellite, such as Asia, Europe, America and so on. A master station of a time synchronous network transmits a message for transmission start to the whole slave stations participating in the time synchronous network(S10). Time comparison participating nations, receiving the message, transmit intrinsic individual signals to the master station through a satellite(S20). The master station remotely controls power of the individual signals of the slave stations(S30). After the control process is completed, time comparison between earth stations is performed(S40). After that, all information of all earth stations including the time comparison result obtained at each earth station is exchanged with time comparison participation standard organs(S50).
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