A display apparatus is disclosed. The present display apparatus comprises: an external input port connectable to an external device and capable of supplying power to the external device; a power supply device for generating DC power corresponding to the external device by using power input from the outside, and submitting the generated DC power to the external input port; a display; and a processor for acquiring first power consumed by the display on the basis of display brightness information, determining second power that can be supplied to the external input port on the basis of first power information and power supplied by the power supply device, receiving, from the external device, information regarding third power required to supply power to the external device connected to the external input port, and determining fourth power supplied to the external input port on the basis of information regarding the second power and the third power. The processor determines an over current protection (OCP) value on the basis of the fourth power and stops power supply to the external device if the current value supplied to the external input port exceeds the OCP value.