1. An image processing apparatus comprising: an image processor that performs an image processing and includes at least one of an image forming unit and an image reading unit, wherein the image forming unit forms an image on a medium based on image data and outputs the image, and the image reading unit reads a document image; an information processor that is controlled by an operating system and performs an information processing function different from the image processing function; and a line concentrator disposed inside the image processing apparatus, wherein the information processor and the image processor are each connected to different network controllers having different network addresses which are connected to a communication network through the line concentrator, and wherein the image processor, the information processor and the line concentrator are disposed inside the image processing apparatus.