Mobile communication terminal, network access system and method thereof using the same

A network access system, comprising:

• an UPnP device for requesting and receiving an Internet service by accessing to a home network with a local IP thereof;
• an external network server for providing the Internet service requested by the UPnP device by using a global IP thereof;
• and
• a mobile communication terminal for mutual-converting a local IP of the UPnP device and the global IP of the pertinent external network server in order to perform the Internet connection.

A network access method using a mobile communication terminal, comprising:

• transmitting a request message for requesting an Internet service to a mobile communication terminal by an UPnP device accessed to a home network by using a local IP thereof;
• parsing the transmitted request message and converting the local IP of the UPnP device into a global IP of an external network server by the mobile communication terminal;
• processing the requested Internet service by the pertinent external network server corresponding to the converted global IP and transmitting it to the mobile communication terminal;
• parsing a reply message and converting the global IP of the external network server into the local IP of the UPnP device by the mobile communication terminal;
• and
• transmitting the reply message to the pertinent UPnP device corresponding to the converted local IP.