DATA MANAGEMENT SYSTEM, DATA MANAGEMENT METHOD, VIRTUAL MEMORY DEVICE, VIRTUAL MEMORY CONTROL METHOD, READER/WRITER DEVICE, IC MODULE ACCESS DEVICE, AND IC MODULE ACCESS CONTROL METHOD

摘要

ABSTRACTAn ID is stored on an IC module, and a link to data ina virtual memory module is formed, whereby a memory of theIC module is virtually expanded. A file structure in a datastorage unit of the IC module has an upper limit value, and the upper limit value is linked to a file structure in the virtual memory module. The virtual memory module is connected to the IC module via a network. When the ICmodule communicates with a reader/writer, if data that issupposed to be stored on the IC module is not present in theIC module, a data storage unit in the virtual memory moduleis accessed.