Disclosed herein is a display apparatus, including, a pixel array section including a plurality of pixels disposed in rows and columns, and a number of power supply lines and scanning lines equal to the number of the rows of the pixels, each of the power supply lines being wired commonly to those of the pixels which are juxtaposed in a direction of a row. An office device is utilized to perform at least one of a copy, a facsimile, a print, and an email. By doing so, a clustered computer system often may be capable of adapting more easily to handle diverse and various types of workloads that may be unknown at the time of deployment of the clustered computer system.