Patent ID: 6876600

Claim:
A portable terminal apparatus having a feature for keeping and displaying time, comprising: a receiver which receives area location information indicating the location of the portable terminal apparatus; an area identification section which identifies the area information of the portable terminal apparatus based on the output from the receiver; a time difference information database which stores information on a time difference from the Greenwich Mean Time by a plurality of area locations; a reference area table which stores reference area location information as the area location information of a reference location of the portable terminal apparatus, said area location information comprising a member of a code set that is defined as a universal standard for indicating location; a timekeeping section which keeps and outputs the reference time that is the time in the reference area; a time controller which obtains time difference information on an area location after movement from the reference area location from the time difference information database, adding/subtracting the obtained time difference information to/from the reference time of the timekeeping section, and automatically calculating the time corresponding to the area location after movement, when the area location of the portable terminal apparatus has changed with the movement of the portable terminal apparatus from the identification result of the area location by the reference area location identification section, thus causing a time difference between the area locations before and after movement; and a display section which displays the time automatically calculated by the time controller.