A wearable device comprising: a camera; a sensor; a display; a laser projector; and a processor configured to, identify a user's gaze based on sensing data obtained by the sensor, identify location information of at least one object (10, 11, 30, 31, 32, 33) included in an image obtained by the camera, distinguish an object (10, 30) being at the position of the user's gaze, and an object (11, 31, 32, 33) being not at the position of the user's gaze, identify a focal length difference between the distinguished objects (10, 30 and 11, 31) to the wearable device, and control the laser projector to provide augmented reality, AR, information (20, 21, 40, 41, 42, 43) related to the object (10, 11, 30, 31, 32, 33) through the display based on the identified user's gaze and location information of the object (10, 11, 30, 31, 32, 33), wherein the laser projector comprises: a light emitting element configured to emit laser light; a focus adjusting element configured to adjust a focal point of the emitted laser light; and a scanning mirror configured to control a scanning direction of the light with the adjusted focal point, and wherein the processor is configured to: control a driving state of the focal adjusting element based on the identified user's gaze, location information of the object (10, 11, 30, 31, 32, 33) and the focal length difference, control the focus adjusting element to sharply display the AR information (20, 40) corresponding to the object at the position of the user's gaze, control the focus adjusting element to blurredly display the AR information (21, 41, 42, 43) corresponding to an object (11, 31, 32, 33) which is not at the position of the user's gaze with different sharpness based on the focal length difference, characterized in that the AR information (21, 41, 42, 43) is not displayed, when an absolute value of the focal length difference exceeds a predetermined value, and a movement path of the scanning mirror is controlled to project light only to sections necessary for displaying the AR information (20, 21, 40, 41, 42, 43). a camera; a sensor; a display; a laser projector; and a processor configured to, identify a user's gaze based on sensing data obtained by the sensor, identify location information of at least one object (10, 11, 30, 31, 32, 33) included in an image obtained by the camera, distinguish an object (10, 30) being at the position of the user's gaze, and an object (11, 31, 32, 33) being not at the position of the user's gaze, identify a focal length difference between the distinguished objects (10, 30 and 11, 31) to the wearable device, and control the laser projector to provide augmented reality, AR, information (20, 21, 40, 41, 42, 43) related to the object (10, 11, 30, 31, 32, 33) through the display based on the identified user's gaze and location information of the object (10, 11, 30, 31, 32, 33), wherein the laser projector comprises: a light emitting element configured to emit laser light; a focus adjusting element configured to adjust a focal point of the emitted laser light; and a scanning mirror configured to control a scanning direction of the light with the adjusted focal point, and wherein the processor is configured to: a light emitting element configured to emit laser light; a focus adjusting element configured to adjust a focal point of the emitted laser light; and a scanning mirror configured to control a scanning direction of the light with the adjusted focal point, and wherein the processor is configured to: control a driving state of the focal adjusting element based on the identified user's gaze, location information of the object (10, 11, 30, 31, 32, 33) and the focal length difference, control the focus adjusting element to sharply display the AR information (20, 40) corresponding to the object at the position of the user's gaze, control the focus adjusting element to blurredly display the AR information (21, 41, 42, 43) corresponding to an object (11, 31, 32, 33) which is not at the position of the user's gaze with different sharpness based on the focal length difference, characterized in that the AR information (21, 41, 42, 43) is not displayed, when an absolute value of the focal length difference exceeds a predetermined value, and a movement path of the scanning mirror is controlled to project light only to sections necessary for displaying the AR information (20, 21, 40, 41, 42, 43).