To provide a display device for a server capable of displaying not only the abnormality of a device for constituting the server but also the operation state of software operated on the server, that is what kind of a processing is performed, by extremely simple constitution.

In this server 4 provided with a motherboard 7, a hard disk 8 and a power unit 9, a programmable IC board 10 connected to the power unit and/or the motherboard and plural display lamps A, B, C, D and E connected to the programmable IC board 10 and lighting-controlled are provided and the operation state and/or abnormality of the hard disk and the power unit are displayed.