Position measurement apparatus that detects location by receiving external signals

A position measurement apparatus (1) comprises receiving units (2, 3), control unit (4), and detection units (12, 22, 33, 43) that detect the motion of device, the position of device, or wearing situation of device, and the timing of receiving information by the receiving units (2, 3) is controlled by the control unit (4) in accordance with the detection results by the detection units (12, 22, 33 and 43).