An electronic device has a GPS receiver that receives satellite signals transmitted from positioning information satellites and computes positioning information; a first storage unit that stores the positioning information and local time information including local time computing information related to the time in the region identified by the positioning information; an update information receiving unit that receives update information for the local time information from an update information transmission device; a second storage unit that stores the update information; a local time computing information acquisition unit that acquires the local time computing information from the first storage unit when the local time computing information corresponding to the positioning information is stored only in the first storage unit, and acquires the local time computing information from the second storage unit when the local time computing information is stored in the second storage unit.