To easily and appropriately hold information for the time of loop processing before and after the start of interruption processing in the control processing of a game machine comprising the loop processing and the interruption processing.

In the main control board 100 of the game machine, three kinds are prepared as specified function memory elements to be used by a CPU 102 for an operation and temporary storage, etc., in the process of performing the control processing. First and second specified function memory elements 110 and 120 comprise the corresponding number and kind of elements, and the CPU 102 can selectively use one of them by a switching command. A third specified function memory element 130 (WCL, WMD or the like) is the element not to be a switching object. When changeover to the second specified function memory element is performed in the interruption processing, the contents of the previously used first specified function memory element can be easily held even during the interruption processing while making it possible to use the contents of the third specified function memory element as they are even in the interruption processing.