1. An evaluation system that obtains a photoelectric conversion signal by photoelectrically detecting an area to be detected including a detection subject on an object, and evaluates a search operation of the detection subject that uses the photoelectric conversion signal, the system comprising: an obtaining unit that obtains results of detection of the detection subject that uses the photoelectric conversion signal in the case the detection subject is assumed to be located at any potential position among a plurality of potential positions within the area to be detected that are a potential for a position of the detection subject; a specifying unit that specifies at least one potential position from among the plurality of potential positions, based on specifying information used to specify a potential position of the detection subject; and an evaluating unit that evaluates a search operation of the detection subject that uses the photoelectric conversion signal, based on the results of detection obtained by the obtaining unit assuming that the detection subject is located at the in the at least one potential position specified by the specifying unit.