Globally, we have moved from a culture centered on network television, cable, AM and FM radio and telephone into a digital society with mass media,streaming information, intelligent computer. To shift to a digital economy, best demonstrated by the explosive growth of the Internet, is transforming everyday products and practices. Ideas expressed in soft wares, chips, communication systems, financial institutions and mass media have enormous leverage worldwide. Beyond emails and online shopping, the Internet promises to change dramatically huge spectrum activities. Its benefits can be well illustrated in the following aspects.