Patent ID: 7233783

Claim:
A mobile telephone system comprising: a mobile telephone base station ( 20 ) connected to a telephone network ( 40 ); and a mobile telephone apparatus ( 10 ) which comprises a first GPS unit ( 6 ) for receiving a GPS wave as a first received GPS signal to obtain position data of said mobile telephone apparatus by information processing with reference to said first received GPS signal and a radio section ( 3 ) connected to said first GPS unit for transmitting, by radio communication, the position data of said mobile telephone apparatus to said mobile telephone base station to make said mobile telephone base station inform said telephone network of the position data of said mobile telephone apparatus; the radio section of said mobile telephone apparatus transmitting by radio communication to said mobile telephone base station, when said first GPS unit does not receive the GPS wave and does not obtain the position data of said mobile telephone apparatus, previous data obtained last as the position data of said mobile telephone apparatus to make said mobile telephone base station inform said telephone network of said previous data as current position data of said mobile telephone apparatus.