1. An image capturing apparatus comprising: a capturing unit configured to capture an image; a detection unit configured to detect an object from the captured image; a generating unit configured to generate a luminance distribution of the captured image; a calculating unit configured to calculate, based on the luminance distribution, an exposure amount used when performing autoexposure bracketing that captures a plurality of images at different exposures; and a correcting unit configured to correct the calculated exposure amount based on feature information of the object detected by the detection unit, wherein the generating unit generates a luminance histogram from luminance information of a plurality of blocks in the captured image, wherein the detection unit detects a face region of a person in the captured image, wherein the calculating unit calculates a main distribution on a low-luminance side and a main distribution on a high-luminance side from the luminance histogram and calculates the exposure amount so that a luminance value determined from the main distribution on the low-luminance side approaches a target value and a luminance value determined from the main distribution on the high-luminance side approaches the target value, and wherein the correcting unit corrects the exposure amount based on the feature information of the face region of the person.