PURPOSE: To prevent the fall of the efficiency of the execution of the freezing of main storage information by determining processors so that the collected information of the processors becomes uniform, and executing the freezing of the main storage information at each processor on the basis of the collected information at the time of freezing main storage.

CONSTITUTION: This system consists of a CPU (central processing unit) 1, a main storage device 2, and an input/output device 3, and the CPU 1 is constituted of plural pieces of the processors CPU1-1 to CPU1-n, and besides, a secondary storage device 8 is connected to the input/output device 3. Then, in the case that the freezing of the main storage information is executed, the main storage information is collected beforehand at the time of the generation of a process, and the processors are determined so that the collected information of the processors becomes uniform, and at the time of freezing the main storage information, each processor executes the freezing processing of the main storage information on the basis of the collected information. Thus, the executing efficiency can be prevented from falling at the time of executing the freezing of the main storage information.