PURPOSE: A multi-net 4 is provided to boot regardless of operating systems by constructing a circuit automatically in accordance with setting environments without a system for separating or exchanging an internal cable in the case that loading forms of an operating system are different from each other. CONSTITUTION: A LAN socket network(11) is connected to a server. An HDD controller main unit(14) receives an address signal and a data signal from the exterior, and generates high/low control signal when a drive selection area is changed by a controller signal. Thus, the HDD controller main unit(14) is selected in accordance with a control signal from a control unit(12) comprising a PAL and makes the first hard disk and the second hard disk select the corresponding drive. An HDD1 controller socket(15) and a HDD2 controller socket(16) are connected to the HDD controller main unit(14) and controls the hard disks, respectively.
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