Time synchronization device, and method and program therefor

A time synchronization device that is capable of selecting whether synchronization with a predetermined standard time by a timepiece unit is performed by receiving a radio wave including information relating to the predetermined standard time and using time information based on the received radio wave, or is performed by means of a holdover instead of the time information, the holdover being performed using a clock signal from an internal or external clock source, the timepiece unit generating a time signal synchronized with the predetermined standard time and outputting the time signal to an exterior, the device comprising:

• a schedule determination unit that determines a schedule according to temporal reception characteristics of the radio wave at a reception location of the radio wave, the schedule having a first time period in which time synchronization is performed using the time information based on the received radio wave, and a second time period in which time synchronization is performed by means of the holdover;
• a clock signal selection unit that selectively supplies to the timepiece unit either one of the time information based on the received radio wave, and the clock signal from the internal or external clock source;
• and
• a control unit that controls the clock signal selection unit according to the schedule determined by the schedule determination unit.