An electronic-circuit assembling process to be carried out in an electronic-circuit assembling system, for assembling an electronic circuit, by mounting electronic circuit components supplied from a component supplier, onto a circuit board, wherein the electronic circuit components includes at least one of different-property components having respective different electrical properties. The process includes: (a) a different-property-component-related information obtaining step of obtaining a different-property-component-related information including (a-i) a property-related information that enables recognition of the electrical property of the different-property component supplied from the component supplier and (a-ii) a different-property-component supply position that is a position of the component supplier supplying the different-property component, such that the different-property-component-related information is obtained by detecting the property-related information and/or the different-property-component supply position; (b) a mounting step of mounting, based on information related to the different-property-component supply position, the electronic circuit components including the different-property component, onto the circuit board; and (c) a property-related information providing step of providing the circuit board with the property-related information of the different-property component mounted on the circuit board.