To use data in a memory region managed by one application and data in a memory region managed by another application in common in an IC card with a plurality of independent applications mounted on a single IC chip.
When the application A is started, update information included in a common set data in a management area Ae of the application A is compared with update information included in a common set data in a management area Be of the application B. When determining that the common information of the application B is the latest as a comparison result, the common information of the application A is updated to the contents of the common information of the application B. The update information of the application A is updated into a value larger than that of the update information of the application B by 1.
TSUNODA KEIICHIRO
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama