In a cellular phone 10, when a CPU 100 detects that a style of the housing is changed to an “open style” or a “view style”, the CPU 100 executes function menu display processing. In the function menu display processing, the CPU 100 automatically selects candidates of function names that are suitable for the current style detected under a predetermined determination condition, and after displaying them in the menu, provides voice guidance thereof. Accordingly, a user does not need to examine which function is suitable for the style. As a result, operability after the style of the housing is changed is enhanced.