1. A parameter configuration apparatus for configuring an image processing parameter used in an image input device, the parameter configuration apparatus comprising: a communication unit that (a) receives, from the image input device, a current parameter value of the image processing parameter, (b) transmits, to the image input device, different parameter values of the image processing parameter, wherein the different parameter values are different from the current parameter value, (c) receives, from the image input device, image data corresponding to the current parameter value, and (d) receives, from the image input device, a plurality of image data corresponding to the different parameter values, the plurality of image data having been processed by the image input device using the respective different parameter values; and a control unit that (a) displays, in a predetermined area of a screen, an image which corresponds to the image data corresponding to the current parameter value, the image data having been received from the image input device, (b) displays, in different areas of the screen, images which correspond to the plurality of image data corresponding to the different parameter values, the plurality of image data having been received from the image input device, wherein the different areas are different from the predetermined area, so that the displayed image which corresponds to the image data corresponding to the current parameter value and the displayed images which correspond to the plurality of image data corresponding to the different parameter values are visible at the same time, and (c) requests the image input device to change the current parameter value to one of the different parameter values which corresponds to a selected one of the images displayed in the different areas.