A projector includes: an image I/F unit that communicates with a document camera; a projection unit that displays an image based on photographic image data received from the document camera via the image I/F unit on a screen; a position detection unit that detects a position of an indicator with respect to the screen; and an instruction information transmission unit that transmits a control command for causing the document camera to perform a process based on a function related to an icon via the image I/F unit in a case in which it is detected that a region corresponding to the icon of the screen is operated with the indicator based on a detection result of the position detection unit.