Information technology has had immense impact on various fields and on almost all the corners of the earth. As Internet witnesses a breathtaking growth, grand visions about network applications have been described before our eneys, such as distance learning, where students may listen to the lectures in a remote classroom and even participate classroom discussion, and telemedicine, where a patient in remote villages may expect to get diagnosis from famous experts or receive body check by medical instruments at the other end of the network. It is easy to reach such a consensus that people in less developed regions are most anxious to share the benefits brought by IT. In fact, however, it is people in poor areas that have received least benefit from the rapid development of IT and network. That is, there is an unequal access to information opportunities.
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