A projection apparatus, comprises a projection unit configured to project an image onto a screen including a target image, a switching unit configured to switch to one of a first image for indicating a position deviation between a projection area in which the projection unit projects an image and the target image, and a second image for increasing contrast of the target image, and a control unit configured to control the projection unit so as to project an image in the projection area based on an image to which the switching unit has switched, wherein the first image is an image that has a predetermined relationship with colors of the target image.