An image generating apparatus according to the present invention includes an image data generator configured to generate a plurality of pieces of image data corresponding to a plurality of radiated light beams based on a plurality of the reception signals, a characteristic-information acquiring unit configured to acquire characteristic information indicating characteristics of an image value group of the plurality of pieces of image data at a certain position, and an information acquiring unit configured to acquire information indicating a possibility that a target exists at the certain position based on the characteristic information.
