An electronic device comprising: a display comprising a first display module and a second display module; the first display module and the second display module configured to display an image by outputting light; the electronic device configured to obtain first luminance data from the first display module and second luminance data from the second display module; the electronic device further comprising: a processor; and a memory, wherein the memory stores instructions set for the processor configured to: store the first luminance data obtained from the first display module and the second luminance data obtained from the second display module; obtain a first average value of the first luminance data by accumulating the first luminance data for a set period and obtain a second average value of the second luminance data by accumulating the second luminance data for the set period, and characterized by being further configured to based on the first average value being different from the second average value by a set value or more, control the display to display guide information to guide a user to change positions of the first display module and the second display module with each other. a display comprising a first display module and a second display module; the first display module and the second display module configured to display an image by outputting light; the electronic device configured to obtain first luminance data from the first display module and second luminance data from the second display module; the electronic device further comprising: a processor; and a memory, wherein the memory stores instructions set for the processor configured to: store the first luminance data obtained from the first display module and the second luminance data obtained from the second display module; obtain a first average value of the first luminance data by accumulating the first luminance data for a set period and obtain a second average value of the second luminance data by accumulating the second luminance data for the set period, and characterized by being further configured to based on the first average value being different from the second average value by a set value or more, control the display to display guide information to guide a user to change positions of the first display module and the second display module with each other. a processor; and a memory, wherein the memory stores instructions set for the processor configured to: store the first luminance data obtained from the first display module and the second luminance data obtained from the second display module; obtain a first average value of the first luminance data by accumulating the first luminance data for a set period and obtain a second average value of the second luminance data by accumulating the second luminance data for the set period, and characterized by being further configured to based on the first average value being different from the second average value by a set value or more, control the display to display guide information to guide a user to change positions of the first display module and the second display module with each other. store the first luminance data obtained from the first display module and the second luminance data obtained from the second display module; obtain a first average value of the first luminance data by accumulating the first luminance data for a set period and obtain a second average value of the second luminance data by accumulating the second luminance data for the set period, and characterized by being further configured to based on the first average value being different from the second average value by a set value or more, control the display to display guide information to guide a user to change positions of the first display module and the second display module with each other.