In an image processing system, a mobile terminal device obtains a position and a direction of each image forming apparatus relative to the mobile terminal device on a basis of respective wireless signals transmitted from each of the image forming apparatuses and is received by a near field communication unit, and displays on a display unit the position and the direction. When an arbitrary image forming apparatus is selected by operation of a touch panel, image data to be printed is transmitted via a network by a network communication section to the selected image forming apparatus.