Disclosed is a mobile telephone in which content displayed in an auxiliary display area is operatively associated with content displayed in a main display area to make possible more effective utilization of the auxiliary display area. A function that presents a display in the main display area and a function that presents a display in the auxiliary display area can be selected to be the same function, whereby the content displayed in the main display area and the content displayed in the auxiliary display area can be operatively associated at all times. Accordingly, a function for which a display is being presented in the main display area is capable of utilizing the auxiliary display area, thereby making it possible to utilize the auxiliary display area effectively irrespective of whether the mobile telephone is open or closed.