The present invention discloses a multimedia device capable of processing a speech-based command. One embodiment of the present invention provides a multimedia device including a memory to store at least one application therein; an application manager for executing any application among the at least one application stored in the memory; and a controller configured to receive a speech-based data from an outside, wherein the controller is configured: to capture video data from a currently-executed application in response to the received speech-based data; to control a network interface module to transmit to a server the captured video data, the received speech-based data, and additional information about the currently-executed application; and to control the network interface module to receive a feedback result value associated with the speech-based data from the server, wherein the feedback result value varies for the same speech-based data based on the captured video data and the additional information about the currently-executed application.