| 摘要 |
When a predetermined time elapses after the start of a screen saver, it is detected whether or not an apparatus is driven by a battery. For AC driving, the apparatus is shifted to a sleep state for power saving, since there is a low power-off risk. For battery driving, it is discriminated whether or not the battery has a sufficient remaining battery level, and the apparatus is shifted to a rest state for avoiding the power-off risk, when the battery has a low remaining battery level. When the remaining battery level is sufficient, the apparatus is shifted to the sleep state and then to the rest state after a first predetermined time, if inspection information is absent, whereas the apparatus is shifted to the sleep state and then to the rest state after a second, longer predetermined time, if the inspection information is present.
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