Streaming-PAS products are located in a secure area and serve as a transmission control server. Policies for network connectivity can be set up and accordingly, obtain packets collected by unsecured GW servers and proceed the transmission. Between the secure area transmission control server and the non-secure area transmission control server, it communicates with the encrypted connection using the exclusive protocol. The security management can only be performed on the administrator's PC connected to the security area transmission control server, and the transmission data is secured with encryption.