An electronic apparatus, comprising: a USB Type-C connection port comprising a plurality of pins; and a processor configured to: based on a connection between a USB Type-C connector of an external apparatus and the connection port, identify whether a first signal received through an HDMI power pin of the USB Type-C connector among the plurality of pins has a first characteristic predefined for the HDMI power pin, based on the first signal having the first characteristic, identify an HDMI protocol corresponding to the first characteristic among a plurality of protocols, and control to communicate with the external apparatus based on the identified HDMI protocol, based on the first signal not having the first characteristic: transmit a second signal to the external apparatus through a USB power pin, the second signal having a second characteristic predefined for the USB power pin, and based on receiving a third signal from the external apparatus through a USB signal pin, the third signal having a third characteristic, identify a USB protocol corresponding to the third characteristic among the plurality of protocols, and control to communicate with the external apparatus based on the identified USB protocol. a USB Type-C connection port comprising a plurality of pins; and a processor configured to: based on a connection between a USB Type-C connector of an external apparatus and the connection port, identify whether a first signal received through an HDMI power pin of the USB Type-C connector among the plurality of pins has a first characteristic predefined for the HDMI power pin, based on the first signal having the first characteristic, identify an HDMI protocol corresponding to the first characteristic among a plurality of protocols, and control to communicate with the external apparatus based on the identified HDMI protocol, based on the first signal not having the first characteristic: transmit a second signal to the external apparatus through a USB power pin, the second signal having a second characteristic predefined for the USB power pin, and based on receiving a third signal from the external apparatus through a USB signal pin, the third signal having a third characteristic, identify a USB protocol corresponding to the third characteristic among the plurality of protocols, and control to communicate with the external apparatus based on the identified USB protocol. based on a connection between a USB Type-C connector of an external apparatus and the connection port, identify whether a first signal received through an HDMI power pin of the USB Type-C connector among the plurality of pins has a first characteristic predefined for the HDMI power pin, based on the first signal having the first characteristic, identify an HDMI protocol corresponding to the first characteristic among a plurality of protocols, and control to communicate with the external apparatus based on the identified HDMI protocol, based on the first signal not having the first characteristic: transmit a second signal to the external apparatus through a USB power pin, the second signal having a second characteristic predefined for the USB power pin, and based on receiving a third signal from the external apparatus through a USB signal pin, the third signal having a third characteristic, identify a USB protocol corresponding to the third characteristic among the plurality of protocols, and control to communicate with the external apparatus based on the identified USB protocol. transmit a second signal to the external apparatus through a USB power pin, the second signal having a second characteristic predefined for the USB power pin, and based on receiving a third signal from the external apparatus through a USB signal pin, the third signal having a third characteristic, identify a USB protocol corresponding to the third characteristic among the plurality of protocols, and control to communicate with the external apparatus based on the identified USB protocol.