To realize prevention of trouble through ringing with a small size, light weight, saved power at a low cost and to enhance the convenience together with prevention of trouble.
A radio base station sharing a specific predetermined area in a service area shared by a plurality of radio base stations is provided with a specific area signal generating section that generates a signal including specific area information denoting the specific area, a portable telephone terminal is provided with a call section 18 that conducts ringing to call in an audible sense or conducts non-ringing to call in a touch sense or visual sense, a specific area information detection section 21 that detects a specific area from a signal sent from a radio base station, and a call switching section 27 that sets the operation of the call section to the non-ringing operation when the specific area information detection section detects a specific area.
SEMASA TAKAYOSHI
FUJIMOTO HITOSHI
