1. An imaging apparatus comprising: a sensor configured to capture a subject image and output an image signal; a subject detection unit configured to detect a subject image based on the image signal output from the sensor; a subject inclination detection unit configured to detect inclination information related to an inclination of the subject image detected by the subject detection unit, wherein the inclination is an inclination of the subject image for a photographing angle of view; and a controller configured to control a display apparatus to display a plurality of reference compositions so that one composition can be selected from the reference compositions by a user, wherein the display of a plurality of reference compositions is performed in conjunction with a display of the detected subject image, and wherein the controller is configured to control an angle of view so that a subject size of the subject image detected by the subject detection unit becomes a predetermined size, wherein the control of the angle of view is performed based on the inclination information detected by the subject inclination detection unit.