PURPOSE: To display intensity of illumination, by dividing output voltage of a solar battery in accordance with intensity of illumination, and applying it to an indicator.

CONSTITUTION: Electric power is supplied to an electronic apparatus DK by solar batteries (a)W(i). A converter P DC/AC-converts output voltage of the batteries (a)W(i), and applies a signal for displaying the intensity of illumination of detecting voltage by a level, to a liquid crystal indicator LC. The indicator LC divides series resistances formed on the liquid crystal, divides voltage to plural potential, and displays the intensity of illumination by 6 grade levels. In this regard, a central operation processor CP executes an operation in accordance with an instruction of an input data to the apparatus DK, and also controls various functions.