RELAY DEVICE

PROBLEM TO BE SOLVED: To provide a relay device installed between a user terminal and a Web server, which inquires of a regulation target database which stores a regulation target address and is installed in an external determination server or included in the relay device whether to permit communication with a destination address of a packet received from the user terminal or not, continues to relay the packet when a result of the inquiry is permission, and shortens delay time in filtering to block the packet when the result is refusal.SOLUTION: A relay device executes processing of a relay processing unit for transferring communication to a Web server, in parallel with sending a query to regulation target databases storing a regulation target list or almost simultaneously without waiting for response from one of the databases, and blocks downstream communication from the Web server on the basis of a result of the query.