A mobile communication device includes a motion sensor for generating motion signals in response to motion of the mobile communication device. A speed control section controls the speed of the engine based on the target speed set by the target speed setting section, which includes an idle speed setting section that corrects the idle speed according to values detected by sensors so that reduction in an output of the engine due to a change in a state quantity associated with an environment under which the engine is placed can be inhibited. The first message includes a first timestamp. The base station selects one allocation mode out of two different allocation modes. In the image processing apparatus, a capacity of a shading memory can be suppressed without reduction in quantifying resolution of the black shading data.