PROGRAM EXECUTING METHOD

PROBLEM TO BE SOLVED: To increase the processing speed for a program without increasing the memory capacity of an SRAM by loading only a previously selected process, which is frequently executed, from a flash ROM to the SRAM and executing it, and executing an unselected process in the flash ROM. SOLUTION: The contents of programs stored in the flash ROM 3 are previously classified into processes which are frequency executed and other processes, and an initial program loader in the ROM 2 load only process parts which are frequently executed to the SRAM (static RAM) 4 for execution in the SRAM 4 and executes other processes in the flash ROM 3 without loading them. This program executing method loads only the previously selected processes which are frequently executed to the SRAM 4 and executes them, and executes other processes in the flash ROM 3, so the processing speed can be increased without increasing the memory capacity of the SRAM 4.