After a power switch 101 is turned on, if the temperature of the auxiliary storage device 105 detected by a first temperature detection unit 108 is lower than a determined first determination temperature T1, a power supply controller 107 turns on power supply to a heater unit 102, to start heating of the auxiliary storage device 105. After the power supply to the heater unit 102 is turned on, if the temperature of the auxiliary storage device 105 is higher than or equal to a first determination temperature T1, and if the temperature of a battery 103 detected by a second temperature detection unit 109 is higher than or equal to a determined second determination temperature T2, the power supply controller 107 starts power supply to an information-processing-device system including the CPU 104, but excluding the heater unit 102.