An image display apparatus comprising: a display; a first interface unit (130 or 135) to exchange data with at least one external device; a controller to perform a control operation to display, when a first mirroring image is received from a first external device, the first mirroring image and to display, when a second mirroring image is received from a second external device, the second mirroring image, wherein, when the second mirroring image is received from the second external device with the first mirroring image displayed, the controller performs a control operation to display an object indicating whether or not to add or substitute the second mirroring image and a preview image for the second mirroring image together, wherein, when an add item of the second mirroring image in the object is selected, the controller performs a control operation to display the first mirroring image and the second mirroring image together on the display, wherein, when a replace item of the second mirroring image in the object is selected, the controller performs a control operation to substitute the second mirroring image for the first mirroring image, and wherein the image display apparatus further comprises a second interface unit to receive a signal from a remote control device, wherein the controller is configured to perform a control operation to display a pointer on the display based on a pointing signal of the remote control device and to increase or decrease a size of a selected area of the display based on a change in distance, while a button of the remote control device is pressed down, of the remote control device from the display in a first direction towards and/or away from the display, and wherein the image display apparatus is configured, while the button of the remote control device is pressed down, to recognize a first movement of the remote control device in the first direction towards and/or away from the display and to not recognize a vertical and lateral movement of the remote control device perpendicular to the first direction. a display; a first interface unit (130 or 135) to exchange data with at least one external device; a controller to perform a control operation to display, when a first mirroring image is received from a first external device, the first mirroring image and to display, when a second mirroring image is received from a second external device, the second mirroring image, wherein, when the second mirroring image is received from the second external device with the first mirroring image displayed, the controller performs a control operation to display an object indicating whether or not to add or substitute the second mirroring image and a preview image for the second mirroring image together, wherein, when an add item of the second mirroring image in the object is selected, the controller performs a control operation to display the first mirroring image and the second mirroring image together on the display, wherein, when a replace item of the second mirroring image in the object is selected, the controller performs a control operation to substitute the second mirroring image for the first mirroring image, and wherein the image display apparatus further comprises a second interface unit to receive a signal from a remote control device, wherein the controller is configured to perform a control operation to display a pointer on the display based on a pointing signal of the remote control device and to increase or decrease a size of a selected area of the display based on a change in distance, while a button of the remote control device is pressed down, of the remote control device from the display in a first direction towards and/or away from the display, and wherein the image display apparatus is configured, while the button of the remote control device is pressed down, to recognize a first movement of the remote control device in the first direction towards and/or away from the display and to not recognize a vertical and lateral movement of the remote control device perpendicular to the first direction.