A control device includes a processor, and the processor is configured to perform a control of: projecting a first image from a plurality of projection apparatuses at different timings; projecting a second image including markers having different colors from at least two or more projection apparatuses of the plurality of projection apparatuses based on captured data of the projected first image; and adjusting a relative projection position among the plurality of projection apparatuses based on captured data of the projected second image.