1. An image pickup apparatus comprising: an image pickup unit configured to image an object and acquire a stereoscopic image formed with multiple viewpoint images; a display unit capable of displaying the stereoscopic image acquired by the image pickup unit; a display control unit configured to display a first guide frame of a predetermined size on the display unit; an object image detection unit configured to detect a specific object image from the stereoscopic image acquired by the image pickup unit; a distance information acquisition unit configured to acquire information which relates to a distance of an object corresponding to the object image detected by the object image detection unit and relates to a distance from the image pickup unit to the object; and a binocular vision suitability determination unit configured to determine whether the object image in the first guide frame is suitable for binocular vision, based on the information which relates to the distance acquired by the distance information acquisition unit, wherein, in a case where the binocular vision suitability determination unit determines that the object image in the first guide frame is suitable for the binocular vision, the display control unit matches at least one of a position and size of the first guide frame to the object image suitable for the binocular vision, wherein the display control unit displays a second guide frame of a larger size than the first guide frame on the display unit in addition to the first guide frame, and, in a case where the object image detection unit detects at least one other object image different from the object image determined to be suitable for the binocular vision by the binocular vision suitability determination unit from the second guide frame, the display control unit matches the second guide frame to the at least one other object image, wherein, in a case where there are a plurality of the object images in the first guide frame, the binocular vision suitability determination unit calculates a difference between a maximum value and minimum value of an object distance in the plurality of the object images as an object distance range, and, in a case where the object distance range is not within an allowable range, determines that the stereoscopic image is not suitable for the binocular vision.