Abstract: According to the theory of Shannon entropy, the Internet standard entropy was defined. By using the global Internet monitor data provided by CAIDA Skitter project, the change of the Internet standard entropy with time were computed and the results using the monitor data got by riesling showed that the Internet standard entropy was reduced from the maximum 0.379 in April 2000 to 0.318 in May 2004, i.e., the reduction per month was 0.12 percent. On the other hand the computing results using the monitor data got by apan-jp showed that the Internet standard entropy was reduced from the maximum 0.388 in April 2000 to 0.297 in May 2004, i.e., the reduction per month was 0.18 percent. The difference between them revealed that the Internet standard entropy tends to reduction. It implies that there is an information metabolism in the evolution process of Internet's macrotopological structure.