Portable mobile terminal and computer readable medium

A portable mobile terminal comprising:

• a terminal body;
• an absolute position detecting unit configured to detect an absolute position of the terminal body;
• a detection control unit configured to determine a detection timing by the absolute position detecting unit and start up the absolute position detecting unit;
• a link information generation unit configured to acquire a line segment indicating a rectilinear distance from when the terminal body starts traveling to a certain direction till when the terminal body changes its traveling direction;
• and
• a movement trajectory calculation unit configured to calculate a movement trajectory of the terminal body based on a detection result of the absolute position detecting unit and an acquisition result of the link information generation unit,
• wherein the detection control unit determines a timing that comes every given time as a tentative detection timing, and in a case where the link information generation unit has not acquired a new line segment till the tentative detection timing after a previous detection timing, the detection control unit determines a timing at which the link information generation unit acquires a new line segment next as a detection timing, and starts up the absolute position detecting unit.