An audio-visual device comprising: a housing; a display comprising a display area; a speaker; a lifter comprising: a motor controller configured to control the lifter; a supporting plate configured to support the display; is a pair of links (60, 70) comprising a first link and a second link; the first link of the pair of links rotatably disposed at one end of the supporting plate; the second link of the pair of links rotatably disposed at another end of the supporting plate; and a driver configured to drive the first link and the second link, wherein the motor controller is further configured to control the driver to move the display upward out of the housing through an opening of a top end of the housing, and a controller configured to: control the speaker to output sound and the display to display information of the sound on a first area comprising a portion of the display area when the lifter, controlled by the motor controller, lifts only the first area of the display area to be exposed out of the housing through the opening of the top end of the housing at a first height position; and control the display to display an image on the first area and a second area of the display area when the lifter, controlled by the motor controller, lifts the first area and the second area of the display area so that the display area is exposed out of the housing at a second height position. a housing; a display comprising a display area; a speaker; a lifter comprising: a motor controller configured to control the lifter; a supporting plate configured to support the display; is a pair of links (60, 70) comprising a first link and a second link; the first link of the pair of links rotatably disposed at one end of the supporting plate; the second link of the pair of links rotatably disposed at another end of the supporting plate; and a driver configured to drive the first link and the second link, wherein the motor controller is further configured to control the driver to move the display upward out of the housing through an opening of a top end of the housing, and a motor controller configured to control the lifter; a supporting plate configured to support the display; is a pair of links (60, 70) comprising a first link and a second link; the first link of the pair of links rotatably disposed at one end of the supporting plate; the second link of the pair of links rotatably disposed at another end of the supporting plate; and a driver configured to drive the first link and the second link, wherein the motor controller is further configured to control the driver to move the display upward out of the housing through an opening of a top end of the housing, and a controller configured to: control the speaker to output sound and the display to display information of the sound on a first area comprising a portion of the display area when the lifter, controlled by the motor controller, lifts only the first area of the display area to be exposed out of the housing through the opening of the top end of the housing at a first height position; and control the display to display an image on the first area and a second area of the display area when the lifter, controlled by the motor controller, lifts the first area and the second area of the display area so that the display area is exposed out of the housing at a second height position. control the speaker to output sound and the display to display information of the sound on a first area comprising a portion of the display area when the lifter, controlled by the motor controller, lifts only the first area of the display area to be exposed out of the housing through the opening of the top end of the housing at a first height position; and control the display to display an image on the first area and a second area of the display area when the lifter, controlled by the motor controller, lifts the first area and the second area of the display area so that the display area is exposed out of the housing at a second height position.