A first object is to provide an apparatus for photocatalytic reaction with high treating efficiency and treatment ability that is not degraded with an elapse of operating time and a second object is to provide a method for simply and efficiently immobilizing a photocatalyst on a support. Such an operating state is present when the slope of the road points in the direction of the vehicle’s future direction of travel andor when the parking brake is engaged. The microelectronic imager assembly further comprises optics supports superimposed relative to the imaging dies. A second image data obtained by the subject user with a digital camera are also stored in the image storage server with the user ID being related to the second image data.