Electronic timepiece and information acquisition method

An information acquisition method of predicted positional information in an electronic timepiece including:

• a radio wave receiver which receives radio waves from a positioning satellite;
• a communicator which performs communication with an external device;
• and a storage which stores predicted positional information of the positioning satellite acquired from other than the positioning satellite, the method comprising an update step of updating the predicted positional information stored in the storage by causing the communicator to acquire the predicted positional information from the external device at or after a predetermined timing corresponding to an update period of the predicted positional information before end of an effective period of the stored predicted positional information, the update period being determined in advance in the external device.