Abstract: The present invention relates to an apparatus and method of securing a network. In the present invention, a pattern matching engine 210 corresponding to a first security module initially performs a hardware-based filtering process for a static attack of an input network packet and transmits a normal packet determined to be normal as a result of the filtering to a dynamic attack detection module 230 corresponding to a second security module through a PL3 interface. The dynamic attack detection module 230 performs a hardware-based filtering process for a dynamic attack of the normal packet transmitted from the pattern matching engine 210. The dynamic attack detection module 230 transmits the filtering result to a main CPU 400 through a PCI 300 if filtering the dynamic attack is completed. Then, a main CPU 400 transmits a response policy based on the transmitted filtering result to a response engine 220 through the PCI 300 and the dynamic attack detection module 230 to block an abnormal packet.