1. An imaging processing system comprising: one or more image capturing apparatuses; a reading unit configured to read biometric information from an authentication object person; a similarity calculation unit configured to calculate similarity based on a result of comparing biometric information read by the reading unit with true biometric information of the authentication object person; an imaging object determination unit configured to determine whether a first person or a second person should be an imaging object, wherein the imaging object determination unit compares a first similarity of the first person with a second similarity of the second person, and determines that the first person should be the imaging object if the first similarity is lower than the second similarity or determines that the second person should be the imaging object if the second similarity is lower than the first similarity; and a control unit configured to cause the one or more image capturing apparatuses to track the person determined by the imaging object determination unit to be the imaging object.