Abstract: A multiprocessor system has a plurality of processors and a network system linking said processors to thereby process a given load written by a logic programming language. According to an initial load balancing algorithm, each processor independently and dynamically selects an initial load segment thereof from the given load by use of a system information representative of characters of the multiprocessor system without transferring information between the processors, whereby an initial load balancing is obtained in the multiprocessor system. According to a load balancing algorithm for reproducing working environments which is performed after performing the initial load balancing algorithm, a partial load segment of a first processor is shared to a second processor. In this case, the first processor generates a history information representative of the working environment thereof, but the amount of the history information is smaller than that of the whole working environment of the first processor.