Embodiments of the present invention provide a method, network element device, and network system for associating a terminal device with a network. Two recess bases are set on the main frame, and each recess base has a plurality of recesses defined on its front for handle portions of wrenches to be engaged. One feature of the present invention is that a thin integrated circuit is formed by a formation method that can form a pattern selectively, on a glass substrate, a quartz substrate, a stainless substrate, a substrate made of synthetic resin having flexibility, such as acryl, or the like except for a bulk substrate. The absolute refractive index of the embedding layer is slightly smaller than that of the columnar portion, thus a laser beam with a single transverse mode is obtained. The computer processes the received update data to determine which of the variable images needs to be updated. A CPU divides a focus area into a plurality of regions to obtain a focus evaluation value from a digital integrator for each of the regions.