A digital television can include a display; an interface to receive a control signal from a remote controller; a communication unit for internet access; a broadcast receiver; and a controller to display broadcast content received through the broadcast receiver, display a screen corresponding to a voice recognition mode in response to entering the voice recognition mode, the screen includes a symbol and text indicating the voice recognition mode, receive a voice command signal corresponding to a voice command through the remote controller in the voice recognition mode while the broadcast content is displayed, in which the voice command is input via a microphone provided in the remote controller, and the input voice command includes a search source and a search keyword, and display a web page corresponding to the search source included in the voice command, which includes a search window including the search keyword and a search result.