1. An image capturing device for capturing an image, comprising: a camera capturing a moving image including images of objects through a lens unit; a compressing an object detection section which compresses the moving image captured by the camera and obtains information relating to at least one of the objects included in the moving image, by utilizing interframe correlation in the moving image captured by the camera; a digital processing circuit extracting information relating to the object which is being included in a still image to be captured by the camera from the information relating to the object obtained by the compressing object detection section relative to the moving image ; and a CPU setting an imaging condition of the camera for capturing the still image of including the object based on the information relating to the object included in the still image extracted by the digital processing circuit.