The invention relates generally to digestive disorders, and in particular to methods for treating irritable bowel syndrome by increasing carbohydrate absorption by administering a composition containing a Bacillus coagulans bacterium. A superimposed image generator calculates a distance of units of the vehicle length based on information concerning the vehicle length stored in a vehicle length information storage and the distance to the another vehicle detected by the distance measurer, and generates a superimposed image based on the calculated distance. The data is capable of causing the coupled computing device to automatically adopt a mode of another computing device coupled to the dock at a different time.