A display order deciding unit decides the display order upon displaying a telephone directory on the basis of setting if the telephone directory is displayed in the display order in response to a usage frequency or in the alphabetical order by a learning function setting unit, the information about the number of callings stored in a count storing unit, setting of the display mode of the telephone directory (by a day of the week) by a display mode selecting unit, and the information of a day of the week that is recognized by a day recognizing unit, and manages it in a display order managing unit. Upon displaying the telephone directory, an information display unit displays the information that is managed by the display order managing unit.