A non-transitory computer-readable medium containing a computer program that, when executed, causes a computer to execute processing including: detecting blood vessel information of a blood vessel included in a predetermined site of a subject based on an image obtained by imaging the predetermined site; generating a projection image of the blood vessel based on the detected blood vessel information; and while causing at least one projector to project the generated projection image, causing the at least one projector to project a virtual operation unit for operating the projection image onto a region excluding a blood vessel region included in the projection image.