Abstract: A computer system for controlling a process, which obtains an exclusive control module (semaphore X, Y, Z) indicating an exclusive use right of a resources (HDD 13, video buffer 140, audio buffer 150, etc.,) commonly shared by two or more processes (task A, B etc.,), so as to obtain the exclusive use right of the resource corresponding to the exclusive control module obtained by said process, and for controlling the process, when said process releases the exclusive control module, so as to lose the exclusive use right of the resource corresponding to the released exclusive control module, wherein exception handlers in which a procedure for processing a resource exclusively controlled by the corresponding semaphore after the task is abnormally terminated is defined for each of semaphore; and when the task is terminated with the semaphore being obtained, activating the exception handler defined corresponding to the semaphore.