Provided is a technology with which it is possible to cause an operator who performs remote operation of a work machine to intuitively recognize the relative positional relationship of an end effector of the work machine and an object in the surroundings thereof. By means of indicators M1, M2 that are outputted to a remote output interface 220 (image output device 221) that constitutes a remote operation device 20, it is possible to cause the operator of the remote operation device 20 to intuitively recognize the length of a gap between the end effector 445 of the work machine 40 and an upper turning body 420, and/or the turning angle of the upper turning body 420 in relation to a lower travel body 410. Moreover, by means of the aspect of the change over time of the indicators M1, M2, it is possible to cause the operator of the remote operation device 20 to intuitively recognize the length of the gap between the end effector 445 of the work machine 40 and the upper turning body 21, and/or the aspect of the change over time of the turning angle of the upper turning body 420 in relation to the lower travel body 410.
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