A display control apparatus for causing a plurality of images to be arranged and projected by a plurality of projection means (40A-40D) so as to form a combined projected image, wherein a portion of a first image and a portion of a second image adjacent to the first image in the combined projected image overlap by an overlap area, the apparatus comprising: an obtaining means arranged to obtain, from a definition unit, a predefined overlap value indicating the width of an overlap area itself or in relation to a resolution or width of the first image, and to obtain a plurality of images divided in advance in consideration of the predefined overlap value so that adjacent divided images overlap each other by an overlap area corresponding to the predefined overlap value; wherein the display control apparatus is further configured to detect, for each of the plurality of projection means, a range of an angle of view at which projection of an image by the projection means is possible based on an image of a projected image captured by an image capturing means; and a control means configured to determine, based on the detected ranges of the angle of view, whether projected first and second images overlap by a width corresponding to the predefined overlap value, and when the first and second images do not overlap by a width corresponding to the predefined overlap value, to change the size of the combined projected image to a size for which an overlap area between the first image and the second image in the combined projected image has a width corresponding to the predefined overlap value; wherein the control means is further arranged to cause the plurality of projection means to project the plurality of images divided in advance in accordance with the determined size of the combined projected image. an obtaining means arranged to obtain, from a definition unit, a predefined overlap value indicating the width of an overlap area itself or in relation to a resolution or width of the first image, and to obtain a plurality of images divided in advance in consideration of the predefined overlap value so that adjacent divided images overlap each other by an overlap area corresponding to the predefined overlap value; to obtain, from a definition unit, a predefined overlap value indicating the width of an overlap area itself or in relation to a resolution or width of the first image, and to obtain a plurality of images divided in advance in consideration of the predefined overlap value so that adjacent divided images overlap each other by an overlap area corresponding to the predefined overlap value; wherein the display control apparatus is further configured to detect, for each of the plurality of projection means, a range of an angle of view at which projection of an image by the projection means is possible based on an image of a projected image captured by an image capturing means; and a control means configured to determine, based on the detected ranges of the angle of view, whether projected first and second images overlap by a width corresponding to the predefined overlap value, and when the first and second images do not overlap by a width corresponding to the predefined overlap value, to change the size of the combined projected image to a size for which an overlap area between the first image and the second image in the combined projected image has a width corresponding to the predefined overlap value; wherein the control means is further arranged to cause the plurality of projection means to project the plurality of images divided in advance in accordance with the determined size of the combined projected image.