A method of supplying suction nozzles with electric components supplied from feeders each of which is operable to feed the electric components to its component-supply portion and which are arranged in a direction intersecting a direction of feeding of the components, the suction nozzles being held by nozzle holders supported by a movable member and arranged in the direction arrangement of the feeders, the movable member being movable to permit each suction nozzle to hold the component by suction, wherein a distance between axes of adjacent ones of the selected suction nozzles in the direction of arrangement of the feeders is adjusted, and/or a component-supply position of each feeder at which the component is located after each feeding action of the feeder is adjusted, so that the selected suction nozzles are aligned with the components at the component-supply positions, and the selected suction nozzles are operated to simultaneously hold the components located at the component-supply positions. Also disclosed is an electric-component mounting system operable to practice the method and mount the electric components on a circuit substrate.