| 摘要 |
PROBLEM TO BE SOLVED: To make accurate time indicated by a clock function that is incorporated inside by automatically acquiring reference time information. SOLUTION: A cellular phone 1 comprises a communication circuit 6, a BT 11, and the like with a control circuit 5 as the center. A clock function 5a is provided in the control circuit 5, thus acquiring reference time information from an external base station or the like using the communication circuit 6 for correction. In a vehicle-mounted clock 3 or a car navigation apparatus 4 as time information acquisition apparatus, a BT 19 is connected with a control circuit 16 having the clock function 15a as the center (BT terminal). The cellular phone 1 inquires the inside of the communication area of the BT 11 for searching for BT terminals 3 and 4, and transmits reference time information if the BT terminals 3 and 4 are present and they request the reference time information, thus acquiring accurate time automatically for correction. |
