Image processing apparatus and method for controlling the same

In a case where a plurality of detection results by a plurality of dictionaries exists for the same subject, a subject type may not be correctly selected. An image processing apparatus includes a subject detection unit configured to detect a plurality of types of subjects for an input image, a detection reliability calculation unit configured to calculate detection reliability for the detected subjects, a priority subject setting unit configured to set the type of a subject as a priority subject, and a main subject determination unit configured to determine a detection result as a main subject from among the detected subjects based on the set priority subject and the detection reliability. the main subject determination unit determines one subject type in the same region based on the set priority subject, the detection reliability, and the types of the detected subjects.