An air conditioner, comprising: a main body; and an air discharger installed in the main body, wherein the air discharger includes: a space formed inside thereof, through which heat exchanged air is discharged; an air discharge port formed along the periphery of the space to deliver heat exchanged air to the space; a light emitting unit arranged adjacent to the air discharge port; and a controller configured to control the light emitting unit in an operating state mode or a lighting mode, wherein the light emitting unit is arranged to correspond to the shape of the air discharge port, wherein the light emitting unit has the space formed inside thereof so that the air discharged from the air discharge port can be delivered outside of the air conditioner through the space, wherein the controller is configured to control the light emitting unit: in the operating state mode, to change setting according to operating state of the air conditioner; and in the lighting mode, to emit a particular light color according to a user input, or to periodically emit and convert a plurality of colors of light in an alternate fashion, and wherein if operating state of the air conditioner is changed during the lighting mode, the controller performs the operating state mode based on the change of operating state and restores the lighting mode after the operating state mode is performed based on the change of operating state. a main body; and an air discharger installed in the main body, wherein the air discharger includes: a space formed inside thereof, through which heat exchanged air is discharged; an air discharge port formed along the periphery of the space to deliver heat exchanged air to the space; a light emitting unit arranged adjacent to the air discharge port; and a controller configured to control the light emitting unit in an operating state mode or a lighting mode, wherein the light emitting unit is arranged to correspond to the shape of the air discharge port, wherein the light emitting unit has the space formed inside thereof so that the air discharged from the air discharge port can be delivered outside of the air conditioner through the space, wherein the controller is configured to control the light emitting unit: in the operating state mode, to change setting according to operating state of the air conditioner; and in the lighting mode, to emit a particular light color according to a user input, or to periodically emit and convert a plurality of colors of light in an alternate fashion, and wherein if operating state of the air conditioner is changed during the lighting mode, the controller performs the operating state mode based on the change of operating state and restores the lighting mode after the operating state mode is performed based on the change of operating state. a space formed inside thereof, through which heat exchanged air is discharged; an air discharge port formed along the periphery of the space to deliver heat exchanged air to the space; a light emitting unit arranged adjacent to the air discharge port; and a controller configured to control the light emitting unit in an operating state mode or a lighting mode, wherein the light emitting unit is arranged to correspond to the shape of the air discharge port, wherein the light emitting unit has the space formed inside thereof so that the air discharged from the air discharge port can be delivered outside of the air conditioner through the space, wherein the controller is configured to control the light emitting unit: in the operating state mode, to change setting according to operating state of the air conditioner; and in the lighting mode, to emit a particular light color according to a user input, or to periodically emit and convert a plurality of colors of light in an alternate fashion, and wherein if operating state of the air conditioner is changed during the lighting mode, the controller performs the operating state mode based on the change of operating state and restores the lighting mode after the operating state mode is performed based on the change of operating state.