A controlling method of a display apparatus , comprising: recognizing an object; based on the object in a predetermined shape being recognized while a mode of the display apparatus is a general driving mode, converting the mode of the display apparatus from the general driving mode to an intermediate mode and displaying, in the intermediate mode, a mode conversion user interface, UI, to convert the mode of the display apparatus from the intermediate mode to a motion task mode; and based on a predetermined user motion corresponding to the mode conversion UI being recognized while the mode conversion UI is displayed, converting the mode of the display apparatus from the intermediate mode to the motion task mode for controlling the display apparatus using a user motion, and displaying a motion task UI for performing a task corresponding to the user motion in the motion task mode, wherein based on the predetermined user motion corresponding to the mode conversion UI not being recognized within a predetermined time after the mode conversion UI is displayed, converting the mode of the display apparatus from the intermediate mode to the general driving mode, wherein a task performed in the intermediate mode using the predetermined user motion is related to the converting of the mode of the display apparatus, wherein the task performed in the motion task mode using the user motion is related to controlling a function of the display device including at least one of volume control of the display device, internet browsing or search of content stored in the display device, and wherein the intermediate mode is less accurate at a user motion recognition than the motion task mode, and wherein the method comprises maintaining the intermediate mode only for a predetermined time period after the mode conversion UI is displayed. recognizing an object; based on the object in a predetermined shape being recognized while a mode of the display apparatus is a general driving mode, converting the mode of the display apparatus from the general driving mode to an intermediate mode and displaying, in the intermediate mode, a mode conversion user interface, UI, to convert the mode of the display apparatus from the intermediate mode to a motion task mode; and based on a predetermined user motion corresponding to the mode conversion UI being recognized while the mode conversion UI is displayed, converting the mode of the display apparatus from the intermediate mode to the motion task mode for controlling the display apparatus using a user motion, and displaying a motion task UI for performing a task corresponding to the user motion in the motion task mode, wherein based on the predetermined user motion corresponding to the mode conversion UI not being recognized within a predetermined time after the mode conversion UI is displayed, converting the mode of the display apparatus from the intermediate mode to the general driving mode, wherein a task performed in the intermediate mode using the predetermined user motion is related to the converting of the mode of the display apparatus, wherein the task performed in the motion task mode using the user motion is related to controlling a function of the display device including at least one of volume control of the display device, internet browsing or search of content stored in the display device, and wherein the intermediate mode is less accurate at a user motion recognition than the motion task mode, and wherein the method comprises maintaining the intermediate mode only for a predetermined time period after the mode conversion UI is displayed. <EOS>