To enable tuning in to a standard radio signal readily. The receiving unit
amplifies a signal output from the variable-capacitance diode with an AGC
amplifier, extracts a time code with the detection circuit, and outputs
the time code to the control unit. The control unit detects the voltage
level of a signal output from the AGC amplifier at points while changing
the capacitance value of the variable-capacitance diode, makes, of the
points where the voltage level has been detected, a point meeting a given
requirement a tuning point, and sets the capacitance value of the
variable-capacitance diode at the tuning point as a capacitance value to
receive a time code when it is judged that the time code has been output
from the detection circuit at the tuning point. Also, the control unit
acquires current time information from the time code, corrects the
current time that the clock unit clocks, and displays the precise current
time with the display unit.