Patent ID: 8781538

Claim:
A portable terminal comprising: first and second solar cell modules arranged on different surfaces of a casing and converting light into electric power, wherein each solar cell module includes an array of solar cells; first and second electric power control parts connected to each of said of first and second solar cell modules respectively, which control a voltage so that electric power obtained from said plurality of first and second solar cell modules is maximized, and supplies the electric power to said portable terminal; a state detection part comprising a mechanical form sensor or an acceleration sensor or an illuminance sensor, configured to identify a current orientation of the portable terminal in response to a change in orientation, and determine which of the first and second solar cell is facing vertically upward based on said identified orientation; and an electric power selection part that is coupled to the state detection part, wherein the electric power selection part deactivates the electric power control part of the corresponding solar cell module that is determined as not facing vertically upward and activates the electric power control part of the corresponding solar cell module that is determined as not facing vertically upward using the determination result received from the state detection part.