A display apparatus comprising: a display, comprising a touch sensor; a microphone; an audio output unit; and a controller configured to: control the display to display a user interface, UI, for an initial setting of the display apparatus and control the audio output unit to output an audio for the initial setting of the display apparatus, the touch sensor and the microphone both being activated, while the UI is displayed on the display, receive one of a touch input through the display and a voice input through the microphone, in response to the touch input being received, set an input mode of the display apparatus to a touch input mode and inactivate the microphone in the touch input mode, in response to the voice input being received, set the input mode of the display apparatus to a voice input mode and inactivate the touch sensor of the display in the voice input mode, control the display to display one of different UIs based on the set input mode, in response to the initial setting of the display apparatus being complete, display a guide screen for a user-customized environment setting, provided in accordance with the set input mode, provide at least one task for the user to perform to determine the degree of disability of the user based on an item for setting an environment of the display apparatus being selected from the guide screen, determine a degree of disability of the user based on performance of the at least one task, and display one or more recommendations for features based on the degree of disability of the user to be selected in accordance with the set input mode. a display, comprising a touch sensor; a microphone; an audio output unit; and a controller configured to: control the display to display a user interface, UI, for an initial setting of the display apparatus and control the audio output unit to output an audio for the initial setting of the display apparatus, the touch sensor and the microphone both being activated, while the UI is displayed on the display, receive one of a touch input through the display and a voice input through the microphone, in response to the touch input being received, set an input mode of the display apparatus to a touch input mode and inactivate the microphone in the touch input mode, in response to the voice input being received, set the input mode of the display apparatus to a voice input mode and inactivate the touch sensor of the display in the voice input mode, control the display to display one of different UIs based on the set input mode, in response to the initial setting of the display apparatus being complete, display a guide screen for a user-customized environment setting, provided in accordance with the set input mode, provide at least one task for the user to perform to determine the degree of disability of the user based on an item for setting an environment of the display apparatus being selected from the guide screen, determine a degree of disability of the user based on performance of the at least one task, and display one or more recommendations for features based on the degree of disability of the user to be selected in accordance with the set input mode. control the display to display a user interface, UI, for an initial setting of the display apparatus and control the audio output unit to output an audio for the initial setting of the display apparatus, the touch sensor and the microphone both being activated, while the UI is displayed on the display, receive one of a touch input through the display and a voice input through the microphone, in response to the touch input being received, set an input mode of the display apparatus to a touch input mode and inactivate the microphone in the touch input mode, in response to the voice input being received, set the input mode of the display apparatus to a voice input mode and inactivate the touch sensor of the display in the voice input mode, control the display to display one of different UIs based on the set input mode, in response to the initial setting of the display apparatus being complete, display a guide screen for a user-customized environment setting, provided in accordance with the set input mode, provide at least one task for the user to perform to determine the degree of disability of the user based on an item for setting an environment of the display apparatus being selected from the guide screen, determine a degree of disability of the user based on performance of the at least one task, and display one or more recommendations for features based on the degree of disability of the user to be selected in accordance with the set input mode.