A display apparatus includes an input/output interface connected to an external device and an input device, a memory, a first processor connected to the memory, and a second processor configured to be recognized as a universal serial bus (USB) device by the external device. The first processor generates a first image related to a function of the display apparatus, and a second image based on image data obtained from the external device, and controls the display to display the first image and the second image together. The first processor obtains an input signal from the input device, and based on a cursor corresponding to the input signal being located on the second image, provides the input signal to the second processor, and the second processor provides the input signal to the external device.