Provided is a new framework to perform zoom processing of a screen displayed on a display by unit of a simple operation. The device is associated with a further magnetic attachment means 32 which is itself attracted to the magnotherapy device such that an item of clothing can be clamped between the magnotherapy device and the attachment means. The plate element has margins adapted for carrying the arrangement. When the output signals are confirmed to be normal, servo control of the wafer stage is performed using a sum of the first positional information and the coordinate offset.