1. N grouping of traffic and a pattern-free Internet worm response method using the N grouping of traffic, the method comprising: grouping various worms into N groups where similar traffic factors generated by the worms are grouped; and involving a worm appearing afterward with a traffic characteristic of a corresponding group defined in advance to allow a network or a system to control forecast/alarm and a countermeasure for a danger of the network or system (here, N is a natural number equal to or greater than 2).