A substrate work system is provided which can reduce the time taken to deal with a communication error by notifying information on the communication error. First confirmation processing section 41A of mounting device 33 determines a cause for a communication error in a communication line between two devices in response to an occurrence of a communication error in first network 18. Display device 42 displays a result of the confirmation by first confirmation processing section 41A in addition to a message informing that a communication error occurs in first network 18. As a result, an operator of substrate work system 10 can confirm in which communication path or the like the communication error is possibly occurring in first network 18 by checking the content displayed on display device 42.
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