A terahertz wave generation element includes a plurality of waveguides including an electro-optic crystal, and an optical coupling member for extracting a terahertz wave to the outside. The pipes provide traffic from a plurality of distributed systems. When the type of apparatus refers to a network connection apparatus, the apparatus generates an instruction to set a filter for cutting off the communications of a worm with the network connection apparatus. The flange portions terminate at a predetermined distance above a top surface of the plate.