INFORMATION ACCESS DEVICE, COMPUTER PROGRAM PRODUCT, INFORMATION PROCESSING SYSTEM, ACCESS CONTROL SYSTEM, PORTABLE TERMINAL, PORTABLE TERMINAL CONTROL METHOD, AND PORTABLE TERMINAL CONTROL PROGRAM PRODUCT

摘要

An object is to avoid an access conflict between a plurality of devices that access an IC module.;A first device (a payment terminal installed in a store, an entrance gate of a station) and a second device (a portable terminal) can access an IC module that is used in an electronic money system. The second device has the function of receiving (detecting) waves (for example, ultrasound) having a predetermined pattern. The predetermined waves indicate that the first device is accessing the IC module. The predetermined waves may be continuously generated from the first device or may be continuously generated from another device (for example, a device installed near the first device). When the second device detects the waves having the predetermined pattern, the second device refrains from accessing the IC module. This makes it possible to implement autonomous conflict control between a plurality of devices that access the IC module that does not have an adequate conflict control function without providing a special control circuit or the like.