1. A stereoscopic image display apparatus, having a function for tracking at least one observer, the stereoscopic image display apparatus comprising: a detection and calculation module, for detecting two positions of two eyes of the observer to configure N views of a displayed image corresponding to the two positions, and for outputting a control information, wherein N≧4; and a display unit, for receiving the control information, and displaying N view images corresponding to the N views, wherein the each of the two eyes receives at least two of the view images, and the view images received by the two eyes respectively belong to different views.