An electronic apparatus includes a main output part to output an image signal, a sub output part to output the image signal to an external apparatus, a connecting sensor to sense whether the external apparatus is connected to the sub output part, and an image processor to output the image signal to the main output part when the external apparatus is not connected to the sub output part and to the sub output part when the external apparatus is connected to the sub output part, depending on a sensing result of the connecting sensor. Accordingly, the electronic apparatus is capable of automatically outputting the image signal to the external apparatus in the case in which the electronic apparatus is connected to the external apparatus.