A data processing apparatus for a collision check with respect to a plurality of rays. The system includes a server station for communicating with terminal devices individually via the network, and a host station for transmitting the same data to all the terminal devices all at once in real time by the digital broadcast. The intersection area having an effective cross-sectional area that is at least equal to the effective cross-sectional area of at least one of the metal sub-interconnect lines having elongated slots formed therein.