| http://www.w3.org/ns/prov#value | - h separate expenses. [0039] Though the communication systems such as WLAN and BLUETOOTH providing services in narrow areas can provide a good quality of services with low expenses, their service areas are not wide and their mobility is limited so that it is necessary to develop technology for enlargement of service area and guarantee of mobility. [0040] Also, there is a problem that when a user of
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