Research and development is actively underway in the Natural User Interface (NUI)-based application program field. This is because existing input devices, including remote controllers, do not satisfy the interface interactivity demanded by users. Consequently, interfaces that are more intuitive and natural are still desired by users. This paper proposes an approach in which a touch interface is implemented by projecting a screen onto a surface using a projector. The technology required to implement the proposed approach is available at a moderate price and is easy to install. In this paper, a Leap Motion device, a ready-made tool, is incorporated to implement the proposed approach. Further, we explain how the proposed approach overcomes the disadvantages present in the Leap Motion device.