System for network inspection and providing method thereof

PURPOSE: A network inspection method and a providing method thereof are provided to obtain a high traffic recognition rate without inspecting all packets generated in a network. CONSTITUTION: A network inspection system receives a plurality of packets from a network(S200). The network inspection system extracts leading packets from flow packets which creates a predetermined flow from the received packets(S220). The network inspection system inspects packets for the extracted leading packets(S230). [Reference numerals] (S200) Packet reception; (S210) Flow creation, storage; (S220) The preceding X number packet extraction of the stored flow; (S230) Output to PIS