An electronic device, comprising: a first structure; a second structure; a flexible display disposed on the first structure; wherein the first structure is movably coupled with the second structure, and wherein in a closed state a second region of the flexible display is covered by the second structure, and in an open state, where the first structure is moved in a first direction with respect the second structure, the second region of the flexible display is exposed from the second structure; and at least one processor configured to: control the flexible display to display an execution screen of a first application in a portrait mode on a first region of the flexible display which is exposed to an outside when the electronic device is in the closed state, detect that the electronic device is in the open state, and based on detecting that the electronic device is in the open state, control the flexible display to display the execution screen of the first application on a portion of the first region in a landscape mode at a first frame rate and a first refresh rate and to display an execution screen of a second application different from the first application on a remaining portion of the first region and the second region of the flexible display being exposed from the second structure in the portrait mode at a second frame rate and a second refresh rate, wherein the first frame rate is lower than the second frame rate, and the first refresh rate is lower than the second refresh rate. a first structure; a second structure; a flexible display disposed on the first structure; wherein the first structure is movably coupled with the second structure, and wherein in a closed state a second region of the flexible display is covered by the second structure, and in an open state, where the first structure is moved in a first direction with respect the second structure, the second region of the flexible display is exposed from the second structure; and at least one processor configured to: control the flexible display to display an execution screen of a first application in a portrait mode on a first region of the flexible display which is exposed to an outside when the electronic device is in the closed state, detect that the electronic device is in the open state, and based on detecting that the electronic device is in the open state, control the flexible display to display the execution screen of the first application on a portion of the first region in a landscape mode at a first frame rate and a first refresh rate and to display an execution screen of a second application different from the first application on a remaining portion of the first region and the second region of the flexible display being exposed from the second structure in the portrait mode at a second frame rate and a second refresh rate, control the flexible display to display an execution screen of a first application in a portrait mode on a first region of the flexible display which is exposed to an outside when the electronic device is in the closed state, detect that the electronic device is in the open state, and based on detecting that the electronic device is in the open state, control the flexible display to display the execution screen of the first application on a portion of the first region in a landscape mode at a first frame rate and a first refresh rate and to display an execution screen of a second application different from the first application on a remaining portion of the first region and the second region of the flexible display being exposed from the second structure in the portrait mode at a second frame rate and a second refresh rate, wherein the first frame rate is lower than the second frame rate, and the first refresh rate is lower than the second refresh rate.