Positional information management system, positional information management method, recording medium, and mobile terminal

A positional information management method for predicting a travel route from a notification point at which a mobile terminal should notify that it is at the point, based on positional data representing a current position of said mobile terminal which acquires acceleration data at a predetermined position, and an acceleration log representing acceleration data in time series acquired by said mobile terminal, the positional data and the acceleration log being notified through a predetermined network, said method comprising:

• a step of storing positional data and an acceleration log in association with times at which they are notified;
• a step of selecting positional data for two positions which are recorded adjacently time-wise, and which are included in a travel route which is a target of prediction;
• a step of extracting an acceleration log corresponding to any of the selected positional data;
• and
• a step of predicting a travel route based on the selected positional data and the extracted acceleration log.

A mobile terminal which comprises:

• an acceleration measuring unit which senses an acceleration and measures an acceleration log;
• a positional information acquiring unit which acquires predetermined positional information;
• a control unit which controls said acceleration measuring unit and said positional information acquiring unit;
• and a storage unit which stores predetermined data, and which sends predetermined information to a management system for managing the positional information,
• wherein said control unit:
• determines whether or not data for specifying a position of said mobile terminal can be acquired by said positional information acquiring unit;
• stores an acceleration log measured by said acceleration measuring unit in said storage unit, in a case where the positional information can not be acquired;
• and
• sends data regarding the position of said mobile terminal acquired by said positional information acquiring unit and the acceleration log stored in said storage unit to said management system, in a case where acquisition of the positional information becomes possible.