A display apparatus comprising: a display unit arranged to display an image thereon; a communication unit arranged to communicate with a plurality of external apparatuses (301, 302, 303) comprising at least one application (372, 472) and to receive candidate instruction words from the plurality of external apparatuses; and a controller arranged to: receive, from a voice acquiring unit among a plurality of external voice acquiring units, a wakeup keyword particular to the voice acquiring unit, or a trigger signal that is input by a manipulation of a predetermined button provided in the voice acquiring unit; enable the voice acquiring unit from which the wakeup keyword or the trigger signal is received, and disable other voice acquiring units among the plurality of external voice acquiring units, in response to the receiving of the wakeup keyword or the trigger signal; receive a voice signal from the enabled voice acquiring unit; recognize a voice corresponding to the received voice signal; and determine an external apparatus corresponding to the recognized voice, and to generate a control command according to a candidate instruction word corresponding to the recognized voice among a plurality of candidate instruction words of the external apparatuses to transmit to the determined external apparatus.. a display unit arranged to display an image thereon; a communication unit arranged to communicate with a plurality of external apparatuses (301, 302, 303) comprising at least one application (372, 472) and to receive candidate instruction words from the plurality of external apparatuses; and a controller arranged to: receive, from a voice acquiring unit among a plurality of external voice acquiring units, a wakeup keyword particular to the voice acquiring unit, or a trigger signal that is input by a manipulation of a predetermined button provided in the voice acquiring unit; enable the voice acquiring unit from which the wakeup keyword or the trigger signal is received, and disable other voice acquiring units among the plurality of external voice acquiring units, in response to the receiving of the wakeup keyword or the trigger signal; receive a voice signal from the enabled voice acquiring unit; recognize a voice corresponding to the received voice signal; and determine an external apparatus corresponding to the recognized voice, and to generate a control command according to a candidate instruction word corresponding to the recognized voice among a plurality of candidate instruction words of the external apparatuses to transmit to the determined external apparatus.. receive, from a voice acquiring unit among a plurality of external voice acquiring units, a wakeup keyword particular to the voice acquiring unit, or a trigger signal that is input by a manipulation of a predetermined button provided in the voice acquiring unit; enable the voice acquiring unit from which the wakeup keyword or the trigger signal is received, and disable other voice acquiring units among the plurality of external voice acquiring units, in response to the receiving of the wakeup keyword or the trigger signal; receive a voice signal from the enabled voice acquiring unit; recognize a voice corresponding to the received voice signal; and determine an external apparatus corresponding to the recognized voice, and to generate a control command according to a candidate instruction word corresponding to the recognized voice among a plurality of candidate instruction words of the external apparatuses to transmit to the determined external apparatus..