Portable card medium, method for managing memory space of portable card medium, method for issuing portable card medium, method for writing program data on portable card medium, and computer readable recording medium with memory space management program recorded therein

摘要

In a portable card medium used for an IC card capable of realizing a plurality of application functions, the portable card medium includes an accepting mechanism (4) to accept an application processing request from a host apparatus (7), an area control mechanism (5) to extract an area (2) of a memory for processing corresponding to the application processing request accepted by the accepting mechanism (4), and request the executing mechanism (3) to perform the processing in the extracted area (2), and an area monitoring mechanism (6) to take as input information of an area having access during program execution in the executing mechanism (3), and monitor whether or not the processing in the executing mechanism (3) is being performed in the area (2) extracted by the area control mechanism (5), thereby preventing data to be managed by other application functions from being fetched.