1. An electronic device comprising: a display panel; a reflective layer; a focus control layer, interposed between the display panel and the reflective layer, comprising a lens array including a plurality of lenses; and a processor configured to: determine a first area where an image is to be displayed; identify whether the first area where the image is to be displayed is included in a designated display area, wherein information displayed within the designated display area is highlighted relative to information displayed within an area other than the designated display area; in response to identifying that the first area is included in the designated display area, change refractive indices of lenses corresponding to the first area included in the designated display area among the plurality of lenses, based on a voltage identified based on a focal length of an object reflected on the reflective layer, wherein a focus of the first area included in the designated display area is different from a focus of a second area other than the first area; and display, based on a focus identified based on the changed refractive indices, the image within the first area.