An image projection apparatus includes an image receiver; an image processor; a projection unit to project a projection image on a projection screen; a coordinate calculator to calculate coordinates of a point in the projection image when the point is identified by a coordinate input device; an interactive communication unit to perform communication related to the interactive input-output capability with the coordinate input device, and the external apparatus; an operation information converter to convert the calculated coordinates of the point and an operation information of the coordinate input device to an operation information for the image projection apparatus and the external apparatus; a distance calculator to calculate distance between the coordinate input device and the projection screen; and an input-action-reproducing determination unit to determine whether movement of coordinates of the point on the projection screen identified by the coordinate input device is reproduced depending on the calculated distance.