1. An image processing device comprising: a detection unit for analyzing a captured image to acquire information on a position of at least one of a face and a body of each character included as a subject; a determination unit for determining whether each character included as the subject in the captured image is an unnoted non-main character, wherein the determination unit determines that a character being absent for a predetermined time from a plurality of images continuously captured is the non-main character on the basis of the information on the position acquired by the detection unit from the plurality of images continuously captured; and a control unit for controlling an image-related process which is a process related to an image on the basis of a status of the character determined as a non-main character, wherein controlling the image-related process includes: lowering sharpness of at least a part of the character in the captured image, responsive to determining that the character is the non-main character.