Patent ID: 7415275

Claim:
A radio frequency selection apparatus in a plurality of cellular systems using a plurality of frequency bands wherein the cellular systems include a higher frequency band system and a lower frequency band system, comprising: an information acquisition unit configured to acquire environmental information about a mobile station for each of one or more of the frequency bands available to the mobile station; and a frequency band determining unit configured to determine based on the environmental information and mobile station information provided by the mobile station which of one or more of the frequency bands is to be used and which of the systems is to be connected to the mobile station, wherein the environmental information comprising a radio-wave-propagation property of the mobile station, and the frequency band determining unit is configured to determine that the higher frequency band system is to be used if the mobile station resides in a better radio-wave-propagation area and the lower frequency band system is to be used if the mobile station resides in a worse radio-wave-propagation area.