1. An image processing system comprising: a portable terminal including a shooting unit and a display unit; a plurality of image processing apparatuses; and a server capable of mutually communicating with said portable terminal, wherein each of said plurality of image processing apparatuses includes a sensor for detecting a state of the image processing apparatus, said server includes a first acquisition unit for acquiring a detected value in said sensor as information of each of said plurality of image processing apparatuses, said server or said portable terminal includes a first processing unit for executing a process of deciding a maintenance order of said plurality of image processing apparatuses by referring to said information of each image processing apparatus, and said portable terminal includes a second processing unit for executing a process of combining a shot image of said image processing apparatus obtained by shooting with said shooting unit, with an image representing said decided maintenance order, and displaying the combined image on said display unit.