PURPOSE: To easily realize the processing program of a desired using by area- dividing the processing program into the program for the unit of processings, executing order information and executing auxiliary information, storing them in an IC card and executing the processing with referring them.

CONSTITUTION: In an IC card 1, a program storing part 4 is composed of an EEPROM, etc., and it is constituted of a processing element program storing area 6, an executing order information storing area 7 and an executing auxiliary information storing area 8. When this IC card 1 is mounted to an IC card reader and writer, etc., and the supplying of a power is received from this (after the power source is turned on), for example, an operation processing part 3 successively read the program designating of the executing order information from the head of the executing order information storing area 7 of the program storing part 4. Thus, the processing to correspond to the usings of various types can be easily realized by the coupling of these executing order information tables and the executing auxiliary information and by the contents rewriting of the executing order information table or the executing auxiliary information.