1. An image capturing apparatus, comprising: an image capturing unit configured to capture an image; a detection unit configured to detect an object in a captured image; a first authentication unit configured to perform authentication on a photographer using first dictionary data in which feature information of the photographer is registered; a second authentication unit configured to perform authentication on the object in the captured image using second dictionary data in which feature information of the object is registered for each photographer; and a switching unit configured to switch the second dictionary data to be used by the second authentication unit in accordance with the photographer authenticated by the first authentication unit.