1. An interactive system for generating 3-dimensional (3D) stereo information, comprising: at least two image capturing units for capturing analog images respectively, and transforming the analog images to digital 2-dimensional (2D) information, wherein the distance between the at least two image capturing units and the focal distance of each of the at least two image capturing units are known; object extraction means for receiving the digital 2D information and extracting object information thereof; processor means for generating 3D information based on the object information, the distance between the at least two image capturing units and the focal distance of each of the at least two image capturing units; and an output interface for outputting the 3D information.