A system for mounting a plurality of circuit components on a circuit substrate, including a substrate supporting device which supports the circuit substrate, a component mounting device which mounts each of the circuit components on the circuit substrate supported by the substrate supporting device, a testing device which tests an actual state in which the each circuit component is mounted on the circuit substrate by the component mounting device, and a control device which controls the component mounting device to mount the each of the circuit components on the circuit substrate and controls the testing device to test, each time one of the circuit components is mounted on the circuit substrate by the component mounting device, an actual state in which the one circuit component is mounted on the circuit substrate.