To simultaneously watch and monitor four sets of VDTs without lateral movement of a person by turning many VDTs (display) toward the center of a circle and installing them as if he is surrounded by them.

One set of VDT is installed in a disk unit 4 and the chief part of the VDT is constituted of an operating top plate 5 and an upper shelf 6, and shaped to have such a form that a polygonal annular ring is radially cut out and a fan-shape viewed from the center of the ring. Sixteen sets of disk units 4 are connected to each other and an opening E is formed at a part of them so that one can get in or out the inside. In this way, one can simultaneously watch and monitor four sets of VDTs without his lateral motion and hence, watching and monitoring oversight can be remarkably reduced. Further, when the VDTs are put also on the upper shelf 6 to turn them outward, they can be simultaneously watched from both inside and outside and hence space efficiency can be improved.