A component mounting system includes a component mounting line in which a plurality of processing devices are connected to constitute the component mounting line and a management device (management computer) connected to the component mounting line by a network, and each of the plurality of processing devices can be remotely operated via the network by an input unit of the management device. In this component mounting system, it is determined whether or not an error occurring in the processing device is a remote response error (ST1) and a remote operation right enabling the remote operation is set (ST21) with respect to the management device based on a result of the error type determination in a case where the type of the error is the remote response error (Yes in ST1).