PURPOSE: To enable plural practical time displays by simple operation, by imparting an alarm time set state to plural time display states and sounding an alarm when the set time is coincided with the time during selective display.

CONSTITUTION: Counters 2, 3 of plural, for example, two times A, B are selected by a switch 4 to enable display to a display apparatus 1 and alarm set time is stored in an alarm counter 5 and, when said set time is coincided with display time, an alarm 7 is sounded. By this method, because the alarm is sounded only in cooperation with the display time, the understanding of function becomes easy.