This is a device for bridging the neck of either an aneurysm in the vasculature and stabilizing the presence of vaso-occlusive devices in that aneurysm. Both the web server computer and the application server computer may implement an application component container. The anchor, according to a first embodiment of the invention includes a stem, an integrally formed rim plate, and a peripheral clamping structure. Thus provided are method and apparatus for efficiently setting such a recording condition that can reduce the influence of difference in characteristics of writable optical disks and difference in characteristics of optical recording and reproducing apparatuses, and to provide a recording and reproducing apparatus. According to this, in an electron beam apparatus provided with a laminate-type electron-emitting device, the deformation of the gate is prevented to reduce variation in electron emission characteristics, thereby preventing the element from being broken. The electrode comprises a discharge portion and an electrical lead which conducts a HF current from a HF source to the discharge portion.