A method of determining disposition of a component supply unit including a component reel obtained by winding a component accommodating tape accommodating a component and a tape feeder that supplies the component accommodating tape drawn out from the component reel, for determining component supply unit disposition in which the component supply unit is disposed in a holding unit that holds the component supply unit, includes acquiring component supply unit information including information on the number of the component reel and constraint condition information including information related to a layout that is capable of being selected when the component supply unit is disposed in the holding unit, and determining the component supply unit disposition, based on the constraint condition information and the information on the number of the component reel.