Apparatus and method of recognizing external device in a communication system

A method of recognizing an external device in a portable terminal, the method comprising:

• transmitting, if the portable terminal is connected to the external device through a connector, a connection message asking whether the external device supports a second connection scheme to the external device by using a first connection scheme;
• receiving a connection response message as a response to the connection message from the external device;
• determining, based on the connection response message, whether the external device supports the second connection scheme;
• and
• recognizing at least one device supporting the second connection scheme in the external device by activating the second connection scheme, if the external device supports the second connection scheme.

A method of recognizing an external device in a portable terminal, the method comprising:

• transmitting, if the portable terminal is connected to the external device through a connector, a connection message asking whether the external device supports Universal Serial Bus (USB) connectivity to the external device by using Mobile High-Definition Link (MHL) connectivity via a Control BUS (CBUS) line of the connector;
• receiving a connection response message as a response to the connection message from the external device via the CBUS line;
• determining, based on the connection response message, whether the external device supports USB connectivity;
• and
• recognizing at least one USB device of the external device by executing a USB host function, if the external device supports USB connectivity.

A method of recognizing a portable terminal in an external device, the method comprising:

• receiving, if the external device is connected to the portable terminal through a connector, a connection message asking whether the external device supports a second connection scheme from the portable terminal by using a first connection scheme;
• generating a connection response message indicating whether the external device supports the second connection scheme as a response to the connection message;
• and
• transmitting the connection response message to the portable terminal by using the first connection scheme.

A method of recognizing a portable terminal in an external device, the method comprising:

• receiving, if the external device is connected to the portable terminal through a connector, a connection message asking whether the external device supports Universal Serial Bus (USB) connectivity from the portable terminal by using Mobile High-Definition Link (MHL) connectivity via a Control BUS (CBUS) line of the connector;
• generating a connection response message indicating whether the external device supports USB connectivity as a response to the connection message;
• and
• transmitting the connection response message to the portable terminal via the CBUS line.