An input unit receives a signal relating to an object. A generation unit generates first information and second information relating to the object based on the signal received by the input unit. A control unit displays the first information that has been generated on a first display device and displays the second information that has been generated on a second display device. The control unit changes the display mode of the first information with the passage of time according to the first regularity and the display mode of the second information with the passage of time according to the second regularity corresponding to the first regularity.