Communication performance of inter-process communication in enhanced for the entire program processing. A process allocation system is provided with a processor which executes a process including a process for performing mutual inter-process communication and holding a logical process placement system, and a process allocation module for allocating each process to the processor, wherein the process allocation module is provided with an inter-processor communication capacity acquisition module for acquiring the communication performance of inter-processor communication which the processor performs with other different processor, a module for specifying the dimensional direction in which the communication traffic of inter-process communication is high in the logical process placement system, and a module for determining a processor having a higher communication performance of inter-processor communication as the allocation destination of a process which is set in the dimensional direction of higher inter-process communication traffic.