| 摘要 |
PROBLEM TO BE SOLVED: To present information for enabling the accurate determination of a battery usable time to a user of a communication terminal device.SOLUTION: A communication terminal device includes: a radio unit for transmitting/receiving a radio wave; an operation circuit for operating the communication terminal device; a presentation unit for presenting information; a battery for supplying power to the communication terminal device; a power source circuit for controlling power supply from the battery; and an arithmetic processing unit. The arithmetic processing unit detects the kind of an operation performed via the operation circuit, detects an operation duration time, and detects the external environment of the communication terminal device via the radio unit. The arithmetic processing unit calculates a remaining battery level so as to allow the battery remaining level of the battery to be calculated in accordance with the kind of the operation and the duration time to be reduced in response to the deterioration of the external environment, and displays the level via the presentation unit. |
