The invention relates to a device, a system and a method for interacting with a target in an operating area. A selection tool is displayed in the operating area in the system; the system comprises an operating device, wherein the operating device is used for sensing a first motion and judging whether the first motion comprises a first specific motion, that is to say, the operatiing device is used for sensing the first motion to determine whether the first motion has a first specific angular motion component so as to set a decision, and when the decision is positive, whether the selection tool falls upon a first target is determined according to a first distance between the selection tool and the first target.