PURPOSE: To simplify an operation by sharing information processing and a real time processing with a UNIX.CPU using UNIX as OS and a real time CPU moving with real time OS, and communicating between the CPUs via an inner bus.

CONSTITUTION: When a system power source is turned ON, a UNIX.CPU 5 and a real time CPU 6 are simultaneously started, 0Ses of the UNIX and the real time are down-loaded in OS memories 51, 61, and a normal operation is started. After a system is started, processes of the CPUs 5, 6 are shared with information processing and real time processing by process sharing means 52, 62. The CPUs 5, 6 execute a simulation of an experiment while closely communicating between the CPUs via an inner bus 9. An experimenter can sort to use the two CPUs as one system merely by describing a desired process with a simple language.