1. A display device comprising: a display that displays an image corresponding to image data of an object generated by an imager; a display controller that controls the display to display a posture guide image in which at least a part of a posture of the object has been changed; a posture determinator that determines similarity between the posture of the object in the image corresponding to the image data generated by the imager and the posture of the object in the posture guide image displayed by the display; a controller that controls the imager to continuously image the object at a time the posture determinator determines that the posture of the object in the image and the posture of the object in the posture guide image are not matched.