Electronic apparatus capable of being connected to multiple external apparatuses having different protocols through a connection port and method of controlling the same

An electronic apparatus includes a connection port having a plurality of pins, the connection port being configured to receive a signal through a first pin, the first pin being predefined to correspond to any one of signals of a plurality of protocols receivable through the connection port; and a processor configured to: identify, based on a connection between a connector of an external apparatus and the connection port, whether the signal has a characteristic defined for the first pin, identify, based on the identification that the signal has the characteristic, a protocol corresponding to the characteristic among the plurality of protocols, and control to communicate with the external apparatus based on the identified protocol.