Disclosed herein is an information processing device including a voltage measuring unit and a determining unit. The voltage measuring unit measures a voltage across the positive and negative terminals of a set of a plurality of dye-sensitized solar cells connected in series. The determining unit determines the number of the dye-sensitized solar cells not generating electricity according to the amount of voltage drop across the positive and negative terminals from the voltage across the positive and negative terminals in the initial state in which all the dye-sensitized solar cells of the set generate electricity at the voltage measured by the voltage measuring unit.