A display device and a method of upgrading the same are disclosed. The display device, such as a Smart TV, may include a broadcast receiver for receiving a broadcast signal, a demultiplexer for demultiplexing the received broadcast signal, a decoder for decoding the demultiplexed broadcast signal, and a display for displaying the decoded broadcast signal. The display device may also include an external device interface for receiving upgrade data from an upgrade device. A controller may be configured to process the received broadcast signal for display on the display and to upgrade the display device using the received upgrade data. The upgrade data may include at least one function. A control module may be configured to assign the at least one function to at least one of the upgrade device or the controller to execute the function on the display device.