During these past five years, the Internet phenomenon has been marked by a tremendous growth of users as well as the amount of available information. Since then, Internet has been inevitable for the information specialists and the network of networks has many advantages: a lower cost medium of communication, user-friendly, a world wide means of communication and exchange and mostly an open way of providing dynamically information to all. Because of its very different nature, searching information on the Internet becomes ever more harder. The user has to be familiar with index search, in order to find the right information. But the unbelievable growth of information sources available on the Internet makes these tools more and more inefficient. Actually, a new generation of index search has sprung off. These tools relieve the user of the repetitive commands associated with online browsing. These tools are called «Intelligent Agent». We propose in this article how can we use an intelligent agent to create and to hold a virtual library active.