A system for managing a component mounting line configured from multiple component mounters arranged in a line along a conveyance path of a circuit board, the component mounters configured to produce a component-mounted board by mounting component on the circuit board, the system comprising: an automatic exchanging device configured to move along the multiple component mounters arranged in a line and automatically exchange automatically exchangeable units of the component mounters; an operation monitoring device configured to monitor an operation state of the automatically exchangeable units of the component mounters and determine whether it is necessary to exchange the automatically exchangeable units due to maintenance or a breakdown; and a management device configured to, when the operation monitoring device determines that exchange of one of the automatically exchangeable units of the component mounters is necessary due to maintenance or a breakdown, move the automatic exchanging device to the component mounter in question and cause the automatic exchanging device to perform automatic exchange of the automatically exchangeable unit of the component mounter with an exchange-use unit characterized in that: the operation monitoring device is configured to send, in advance, to the management device, information related to the automatically exchangeable unit for a case in which it was possible to predict a timing at which exchange of the automatically exchangeable unit of the component mounter is required due to maintenance or a breakdown, and the management device is configured to, when the information related to the exchange of the automatically exchangeable unit of the component mounter is received in advance from the operation monitoring device, as preparation for exchange of the automatically exchangeable unit, move the automatic exchanging device to or near to the component mounter. an automatic exchanging device configured to move along the multiple component mounters arranged in a line and automatically exchange automatically exchangeable units of the component mounters; an operation monitoring device configured to monitor an operation state of the automatically exchangeable units of the component mounters and determine whether it is necessary to exchange the automatically exchangeable units due to maintenance or a breakdown; and a management device configured to, when the operation monitoring device determines that exchange of one of the automatically exchangeable units of the component mounters is necessary due to maintenance or a breakdown, move the automatic exchanging device to the component mounter in question and cause the automatic exchanging device to perform automatic exchange of the automatically exchangeable unit of the component mounter with an exchange-use unit characterized in that: the operation monitoring device is configured to send, in advance, to the management device, information related to the automatically exchangeable unit for a case in which it was possible to predict a timing at which exchange of the automatically exchangeable unit of the component mounter is required due to maintenance or a breakdown, and the management device is configured to, when the information related to the exchange of the automatically exchangeable unit of the component mounter is received in advance from the operation monitoring device, as preparation for exchange of the automatically exchangeable unit, move the automatic exchanging device to or near to the component mounter. the operation monitoring device is configured to send, in advance, to the management device, information related to the automatically exchangeable unit for a case in which it was possible to predict a timing at which exchange of the automatically exchangeable unit of the component mounter is required due to maintenance or a breakdown, and the management device is configured to, when the information related to the exchange of the automatically exchangeable unit of the component mounter is received in advance from the operation monitoring device, as preparation for exchange of the automatically exchangeable unit, move the automatic exchanging device to or near to the component mounter.