1. A hierarchical crossbar interconnection network for parallel processing computer, having clusters of nodes and crossbar networks, comprising: a crossbar network is composed of "n" (any integer) number of crossbar switches, eight links for connecting lower level clusters or processing nodes, and two links for connecting other clusters; a low-level cluster is formed by connecting a maximum of eight processing nodes between two crossbar networks; a high-level cluster is formed by connecting a maximum of eight low-level clusters between four crossbar networks; and a hierarchical crossbar interconnection network for a cluster-based parallel processing computer, having low delay latency is formed by directly connecting two low-level clusters or by directly connecting two high-level clusters.