A displaying method of a user terminal device including a single flexible display which is divided into a first area and a second area by a hinge, and an exposure area of the first area being not covered by the second area when the user terminal device is folded so that the first area faces the second area and while a message received from the outside is displayed on the exposure area, the method comprising: detecting one of a first user interaction and a second user interaction different from the first user interaction on the exposure area while the user terminal is folded along the hinge such that the first area faces the second area; and displaying a first function execution screen on the exposure area in response to detecting the first user interaction on the exposure area, and displaying a second function execution screen on the exposure area in response to detecting the second user interaction on the exposure area, wherein the first area is continuous, wherein the first user interaction comprises movement in a first direction along the long side of the exposure area and movement in a second direction opposite to the first direction along a long side of the exposure area, and the second user interaction comprises movement along a short side of the exposure area, wherein the displaying the first function execution screen of the application providing the first function on the exposure area comprises: displaying a third function execution screen on the exposure area in response to detecting movement in the first direction, and displaying a fourth function execution screen on the exposure area in response to detecting movement in the second direction, wherein the first function execution screen is a message application execution screen for providing one of a next message, a previous message, an indication that the message is stored, and an indication that the message is deleted, and wherein the second function execution screen is another message application execution screen for providing another one of the next message, the previous message, the indication that the message is stored, and the indication that the message is deleted. detecting one of a first user interaction and a second user interaction different from the first user interaction on the exposure area while the user terminal is folded along the hinge such that the first area faces the second area; and displaying a first function execution screen on the exposure area in response to detecting the first user interaction on the exposure area, and displaying a second function execution screen on the exposure area in response to detecting the second user interaction on the exposure area, wherein the first area is continuous, wherein the first user interaction comprises movement in a first direction along the long side of the exposure area and movement in a second direction opposite to the first direction along a long side of the exposure area, and the second user interaction comprises movement along a short side of the exposure area, wherein the displaying the first function execution screen of the application providing the first function on the exposure area comprises: displaying a third function execution screen on the exposure area in response to detecting movement in the first direction, and displaying a fourth function execution screen on the exposure area in response to detecting movement in the second direction, wherein the first function execution screen is a message application execution screen for providing one of a next message, a previous message, an indication that the message is stored, and an indication that the message is deleted, and wherein the second function execution screen is another message application execution screen for providing another one of the next message, the previous message, the indication that the message is stored, and the indication that the message is deleted.