As information society is more and more deeloped, the importance of information filtering is gradually growing. That is, it is crucial to select the exactly necessary information for making decisions among a variety ofinformation. This study reviewed the theoretical framework of information filtering, which is systematically carrying out the above-mentioned mission in the space of producing and transferring digital information likewise Internet, and examined the informat n services on demand by applying information filtering. The more efficient information center is, the more positive it is to find out the way to give users value-added information through continuous monitoring, filtering and evaluation of incoming information.