A display apparatus comprising: a display unit configured to display an image; a storage unit configured to store a data; and a controller configured to: obtain instruction words which are provided by at least one application (172, 173); control the storage unit to store the obtained instruction words and information corresponding to the applications from which the instruction words are obtained; register as candidate instruction words, in a voice recognition program, the instruction words stored in the storage unit; based on a wakeup keyword being received from one of a first external voice acquiring unit and a second external voice acquiring unit, enable reception of a voice signal from the one of the first external voice acquiring unit and the second external voice acquiring unit from which the wakeup keyword is received, and disable reception of a voice signal from the other of the first external voice acquiring unit and the second external voice acquiring unit; based on a voice signal being received by the voice recognition program from the enabled one of the first external voice acquiring unit and the second external voice acquiring unit, perform a voice recognition process using the voice recognition program, identify an instruction word corresponding to the voice signal from among the registered instruction words; identify an application to perform an instruction corresponding to the identified instruction word corresponding to the voice signal based on the application information corresponding to the identified instruction word; and perform a control operation for the identified application to operate based on the identified instruction word. a display unit configured to display an image; a storage unit configured to store a data; and a controller configured to: obtain instruction words which are provided by at least one application (172, 173); control the storage unit to store the obtained instruction words and information corresponding to the applications from which the instruction words are obtained; register as candidate instruction words, in a voice recognition program, the instruction words stored in the storage unit; based on a wakeup keyword being received from one of a first external voice acquiring unit and a second external voice acquiring unit, enable reception of a voice signal from the one of the first external voice acquiring unit and the second external voice acquiring unit from which the wakeup keyword is received, and disable reception of a voice signal from the other of the first external voice acquiring unit and the second external voice acquiring unit; based on a voice signal being received by the voice recognition program from the enabled one of the first external voice acquiring unit and the second external voice acquiring unit, perform a voice recognition process using the voice recognition program, identify an instruction word corresponding to the voice signal from among the registered instruction words; identify an application to perform an instruction corresponding to the identified instruction word corresponding to the voice signal based on the application information corresponding to the identified instruction word; and perform a control operation for the identified application to operate based on the identified instruction word. obtain instruction words which are provided by at least one application (172, 173); control the storage unit to store the obtained instruction words and information corresponding to the applications from which the instruction words are obtained; register as candidate instruction words, in a voice recognition program, the instruction words stored in the storage unit; based on a wakeup keyword being received from one of a first external voice acquiring unit and a second external voice acquiring unit, enable reception of a voice signal from the one of the first external voice acquiring unit and the second external voice acquiring unit from which the wakeup keyword is received, and disable reception of a voice signal from the other of the first external voice acquiring unit and the second external voice acquiring unit; based on a voice signal being received by the voice recognition program from the enabled one of the first external voice acquiring unit and the second external voice acquiring unit, perform a voice recognition process using the voice recognition program, identify an instruction word corresponding to the voice signal from among the registered instruction words; identify an application to perform an instruction corresponding to the identified instruction word corresponding to the voice signal based on the application information corresponding to the identified instruction word; and perform a control operation for the identified application to operate based on the identified instruction word.