Patent ID: 8351958

Claim:
A mobile device which identifies a location of said mobile device in relation to a user, said mobile device comprising: an operation input unit configured to receive an input of operation information entered by the user; a sensor unit configured to detect speed information regarding said mobile device; a reference point rule holding unit configured to hold reference point rules each of which indicates a relationship between the operation information and a reference point which indicates the location of said mobile device at a point in time when the input of the operation information is received; a reference point determining unit configured to determine, as an operation reference point, the reference point corresponding to the operation information received by said operation input unit, with reference to the reference point rules; a trajectory calculating unit configured to calculate a movement trajectory of said mobile device, based on the speed information detected by said sensor unit; and a location identifying unit configured to identify a location of an end point of the movement trajectory originating at a start point that is a point corresponding to the operation reference point, using the movement trajectory calculated by said trajectory calculating unit.