| 摘要 |
<p>An information processing device comprises a display unit (22) whose display brightness is changeable, a unit (201) for detecting the lightness of surroundings, a unit (11) for determining a target display brightness of the display unit responsive to the lightness detected by the unit for detecting the lightness, and a unit (11) for changing the display brightness of the display unit in steps until the target display brightness is reached when changing the display brightness to the target display brightness determined by the unit for determining the target display brightness.
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