| 摘要 |
A computer system prevents an illegal program transmitted from an external communication device to a computer system such as IC cards and stored therein from being executed. The system comprises a CPU, a communication circuit, a first memory area storing a first and second computer program, a second memory area including storage areas for the first computer program, for data received by the communication circuit, for data used in program execution of the CPU. When a program to be executed by the CPU is the first computer program, if the program code is stored in the first memory area or a storage area for the first computer program in the second memory area, the program is allowed to be executed, and if the program code is stored in the second memory area other than the storage area for the first computer program, the program is not allowed to be executed.
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