Mobile device, service information providing device, and roaming method

摘要

A mobile apparatus that can perform roaming without being provided with a region preset table storing usable frequency information and so forth for each area. A service information provision apparatus that provides this mobile apparatus with various kinds of information necessary when roaming is performed. A roaming method associated with the movement of this mobile apparatus. A mobile apparatus 100 performs radio communication by means of a cellular method, and has an identification information storage section 101 that stores identification information of a network provider that provides a radio communication service by means of a cellular method, a specific frequency transmitting/receiving section 102 that transmits a signal containing identification information and receives a signal containing information on frequency and access technology corresponding to the identification information, and a frequency search section 103 that carries out a frequency search when roaming is performed using a frequency and access technology corresponding to identification information indicated by a signal received by specific frequency transmitting/receiving section 102.