An electronic device comprising: a display; and a processor for controlling the electronic device to operate in one of a wallpaper mode and a content mode, the device characterized in that the processor is configured to: based on a first user command being input while the display operates in the content mode for reproducing a broadcast content, control the display to change and display the broadcast content to a first UI for entering the wallpaper mode, the first user command being a command to turn off a power of the electronic device, control the electronic device to operate in the wallpaper mode based on a third user command being input while the first UI is displayed with a size of the first UI gradually decreasing, and in the absence of the third user command being input while the first UI is displayed with the size of the first UI decreased such that then the first UI disappears, turn off the electronic device, and based on a second user command being input while the display operates in the content mode, control the display to change and display the broadcast content to a preset wallpaper, wherein the second user command is input by a wallpaper button of a remote control device. a display; and a processor for controlling the electronic device to operate in one of a wallpaper mode and a content mode, the device characterized in that the processor is configured to: based on a first user command being input while the display operates in the content mode for reproducing a broadcast content, control the display to change and display the broadcast content to a first UI for entering the wallpaper mode, the first user command being a command to turn off a power of the electronic device, control the electronic device to operate in the wallpaper mode based on a third user command being input while the first UI is displayed with a size of the first UI gradually decreasing, and in the absence of the third user command being input while the first UI is displayed with the size of the first UI decreased such that then the first UI disappears, turn off the electronic device, and based on a second user command being input while the display operates in the content mode, control the display to change and display the broadcast content to a preset wallpaper, wherein the second user command is input by a wallpaper button of a remote control device. based on a first user command being input while the display operates in the content mode for reproducing a broadcast content, control the display to change and display the broadcast content to a first UI for entering the wallpaper mode, the first user command being a command to turn off a power of the electronic device, control the electronic device to operate in the wallpaper mode based on a third user command being input while the first UI is displayed with a size of the first UI gradually decreasing, and in the absence of the third user command being input while the first UI is displayed with the size of the first UI decreased such that then the first UI disappears, turn off the electronic device, and based on a second user command being input while the display operates in the content mode, control the display to change and display the broadcast content to a preset wallpaper, wherein the second user command is input by a wallpaper button of a remote control device.