1. An object detection frame display apparatus comprising: an object detection frame calculator, implemented by a processor, that determines first object detection frames each indicating a region of a detection target object from an input image, and that further determines a second object detection frame by integrating the first object detection frames analogically inferred to be object detection frames related to a same detection target object; a containment frame calculator, implemented by a processor, that determines, for each second object detection frame, a third object detection frame containing the first object detection frames serving as a basis for determining the second object detection frame; a display frame former, implemented by a processor, that provides an object detection frame to be displayed, based on a relationship of a size of the second object detection frame with respect to a size of the third object detection frame; and a display that displays the object detection frame provided by the display frame former, wherein the display frame former provides an object detection frame that is an enlargement of the second object detection frame, when the size of the second object detection frame in relationship to the size of the third object detection frame is less than a threshold.