1. An image pickup device, comprising: a pickup device that captures an image; a background image processor that determines a pickup object area to be captured to be an illumination image, and displays the pickup object area as a background image; a display that displays the background image; and a main controller that generates a control signal that controls the pickup device, the background image processor, and the display, wherein the background image processor comprises: an internal pattern generator that generates the illumination image that distinguishes the pickup object area and a background image area; an image mixing device that mixes the background image and the generated illumination image according to a selection signal and outputs the mixed resultant image as a pickup background image; a second storage device that employs the background image in which the pickup object area is displayed as the background image area as the pickup background image, and stores the resultant image; and an auxiliary controller that separates the pickup object area from the background image, and outputs the separated result as the selection signal.