An electronic device is provided, which includes a user interface unit configured to receive an input of a user command, a controller configured to perform an operation according to the input user command and to control the user interface to display a screen according to the result of the operation, and a power supply configured to provide a power to the user interface and the controller, wherein the power supply includes a plurality of converters configured to supply the power to respective loads of the electronic device, and the plurality of converters output voltage values that correspond to levels of the respective loads connected thereto.