PURPOSE: To execute parallel processing without recompiling object codes even when the hardware constitution of a parallel processing system is changed by providing a mechanism for exclusively controlling access to variables shared at the time of parallel execution and dynamically performing the processing block assignment of the parallel execution realized by an interpreter for executing an intermediate language outputted by a compiler.

CONSTITUTION: This multiprocessor is provided with a compiling mechanism 102 having a means for analyzing program description for generating the access at least to shared memory source assignment and the means for analyzing the description for a program processing unit capable of parallel processing and performing processor assignment. Then, interpreting mechanisms 111 and 112 for executing the intermediate language outputted by the compiling mechanism 102 are provided to dynamically perform the processing block assignment of the parallel execution realized by the interpreting mechanisms 111 and 112.