Human-beings can localize a direction from which a sound transmits. This is attributed to a difference of arrival time between two ears. This difference is defined as Interaural Time Difference (ITD). In other words, a sound image at a desired position is designed by controlling the ITD. A stereo effect has been proposed as the technique to control ITD for designing a sound image and requires two loudspeakers. On the other hand, we have focused on the stereo effects with a parametric loudspeaker, which has a sharper directivity because an ultrasound is utilized. In addition, the reflected sound of the signal emitted by the parametric loudspeaker also has a sharper directivity. We assumed that a single parametric loudspeaker can realize stereo effects, provided that this loudspeaker is able to emit a sound to two directions based on these characteristics. In this paper, we proposed the system to realize the stereo effects with a single parametric loudspeaker. We carried out the experiments for designing the sound image and moving the sound image. As a result, we confirmed that a single parametric loudspeaker could realize stereo effects and design a sound image and a moving sound image.