Device and method for chasing root of invader

PURPOSE: A device and method for chasing the root of an invader is provided to execute a reverse chase of the root of an invader sequentially without changing components of a network through all networks including the Internet. CONSTITUTION: A detection module(7) detects an invasion and analyzes an invasion-detected system. A reverse chase agent(2) obtains an IP address of a previous system based on traces created in the system caused by an invasion. A server(4) receives an IP address of the system analyzed from the detection module(7) and the reverse chase agent(2), and monitors/manages a chase state of the reverse chase agent(2). An agent installation module(5) installs the reverse chase agent(2) in the system of the IP address being supplied from the server(4). An analysis module(3) communicates the reverse chase agent(2) with the server(4) safely and analyzes the system based on the obtained IP address. A data managing module(6) stores a series of chase and analysis processes being supplied from the server(4) and supplies data necessary for a searching process to the server(4).