A mobile communication apparatus includes: a first casing including a display unit having a backlight; a second casing being connected to the first casing, and having an input unit; a condition detecting unit that detects whether a condition is changed from a first condition to a second condition, the first condition in which the first casing is overlapped with the second casing, the second condition being different from the first condition; and a control unit that controls the backlight to illuminate the display unit by turning on the backlight in a certain turn-on condition when the condition detecting unit detects that the first condition is changed to the second condition. The backlight is turned on in a lower value than a normal value in at least one of luminance and illuminance.