Apparatus for isolating and relaying with integration function and method for establishing security policy using the same

Is connected through a plurality of terminal devices and the network, via the Internet is connected to the central server, to download the security target applied to the terminal device from the central server to store the security target database and set to allow or block the security target security target setting module; A block and a relay device having integrated functions, including connection module for extracting information on the security target set by the security target setting module from the security target database to block access to the security object according to the terminal apparatus or permit is disclosed.