According to the present invention, when the remote operation, of a work machine 40 through one remote operation device 20 as a first remote operation device operated by one operator, is to be stopped, if another operator, who may potentially continue the remote operation of the same work machine 40 through another remote operation device 20 as a second remote operation device, is present, the operation of an engine 460 of the work machine 40 is continued without stopping. Therefore, the other operator can immediately remotely operate, through the second remote operation device, a work machine 40 that has heretofore been the operation target of the first remote operation device without restarting and warming up the engine 460 of the work machine 40.
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