1. A photovoltaic devices inspection apparatus for determining whether a photovoltaic cell of photovoltaic devices is defective or non-defective, the photovoltaic devices inspection apparatus comprising: a power means configured to apply a current to a photovoltaic cell as an inspection-object; a photographing means configured to photograph the photovoltaic cell when the photovoltaic cell emits light in response to said current applied from the power means; and an analyzing means configured to analyze an image photographed from the photovoltaic cell by using the photographing means, wherein the analyzing means calculates a threshold value based on an average brightness of a region of the photographed image where bright and dark parts are mixed in respect to the photographed image of the photovoltaic cell using the photographing means, and the analyzing means divides the photographed image into bright and dark regions based on the threshold value, enhances the bright and dark regions by binarizing and displaying the bright and dark regions, and determines existence of a defect for each photovoltaic cell of the photovoltaic devices.