An information processing apparatus including a memory storing instructions, and at least one processor configured to process the instructions to obtain an orientation, size, and position of a first subject in a first image, and an orientation, size, and position of a second subject in a second image, generate an estimated position of the first subject in the second image based on the orientation, size, and position of the first subject in the first image and the orientation and size of the second subject in the second image, calculate a distance between the estimated position of the first subject in the second image and the position of the second subject in the second image; and determine whether or not the first subject is the second subject based on the distance.