| 摘要 |
PROBLEM TO BE SOLVED: To save power efficiently. SOLUTION: A portable telephone set is provided with a portable telephone radio part 4 and a Bluetooth(BT) radio part 5 which is different in power consumption. A voltage control part 6 supplies voltage from a battery 1 to the portable telephone radio part 4 and the BT radio part 5 as an operation voltage. A main control part 8 controls the operation of the portable telephone radio part 4 and the BT radio part 5 according to the size (supply possible voltage value) of the operating voltage which the voltage control part 6 can supply. More specifically, the main control part 8 causes the function of the portable telephone radio part 4 with large power consumption to stop and operates only the BT radio part 5 with small power consumption, when the supply possible voltage value can operate only the portable telephone radio part 4 or the BT radio part 5. |
