Abstract: When one module provides service while using a service providing function of other module, the service requesting module sends out a service request to other modules in a broadcast fashion. Each module receives and detects the service request, and when there is a corresponding service providing function in its own module, it sends a response back to the requesting module. Among a plurality of nodes, a selection function module which stores service providing function arrangement information of other nodes and determines a node which has the function for the corresponding service request is provided. The selection function module sends back a response to the service request.

Abstract: Basic operation clock generators for effecting frequency division of the system clock are provided for respective ones of a plurality of processors, and the basic operation clock generators associated with respective processors are connected in cascade. The basic operation clock generator of the preceding stage produces a synchronization signal in response to each particular state of the basic operation clock signal and supplies the synchronization signal to a basic operation clock generator of a succeeding stage, and the basic operation clock generator of the succeeding stage establishes the initial state in the basic operation clock signal by using the synchronization signal supplied from the basic operation clock generator as a control signal, whereby the phases of basic operation clock signals of respective processors are matched to each other.