PROJECTION DISPLAY SYSTEM, INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND STORAGE MEDIUM THEREFOR

A projection control apparatus includes an acquisition unit configured to acquire a captured image of a projection plane on which a first image is projected by a projection unit, a specification unit configured to specify an image projection area of the projection unit within the captured image acquired by the acquisition unit, an association unit configured to, in the captured image of the projection plane on which a second image different from the first image is projected by the projection unit, associate coordinates on the image projection area specified by the specification unit with coordinates managed by the projection unit, and a control unit configured to calculate distortion correction parameter for the projection unit by using an association result of the between the coordinates by the association unit. The projection control apparatus can reduce the time for adjustment of a projection image shape.