An image projection apparatus (100) configurable with a coordinate input device (200), each having interactive input-output capability, includes an image receiver (121) to receive an image signal; an image processor (124) to convert the image signal received by the image receiver (121) to a projection signal; a projection unit (122) to project a projection image on a projection screen (10) using the projection signal converted by the image processor (124); a coordinate calculator (125) to calculate coordinates of a point in the projection image on the projection screen (10) when the point is identified by the coordinate input device (200) and information of coordinates of the identified point is input from the coordinate input device (200) to the image projection apparatus (100); an interactive communication unit (129) to perform communication of information related to the interactive input-output capability with the coordinate input device (200), and an external apparatus (300) that outputs the image signal to the image receiver (121); a user direction detector (126) to detect a user direction where a user that performs an operation of inputting the coordinates of the point by using the coordinate input device (200) exists based on the coordinates of the point input by the coordinate input device (200) and information of coordinates defining an area of the projection screen (10); and a screen rotation determination unit (123) to determine whether the user is performing the operation of inputting the coordinates of the point, and to determine whether the projection screen (10) is to be rotated by using the image processor (124) based on the user direction detected by the user direction detector (126).