An apparatus that presents a projection image has a screen and plural projectors, each of which projects a section of the projection image onto the screen. The apparatus has a projected-section-determining unit that determines as a projected section the section of the projection image, based on an input image signal, corresponding to a part of the screen onto which each of the projectors projects the section of the projection image. The apparatus has an image-signal-generating unit that generates an image signal corresponding to the section of the projection image which each of the projector projects onto the part of the screen, based on the input image signal and the projected section determined by the projected-section-determining unit, and a projectors-controlling unit that controls the projectors to adjust centers and/or ranges of the projections by the projectors based on the projected section determined by the projected-section-determining unit.