Disclosed is a display controller including: a main display control unit for controlling a display performed by a main display unit on the basis of main operation information from a main operation unit; and a sub display control unit for controlling a display performed by a sub display unit on the basis of sub operation information from a sub operation unit. When the main operation unit is receiving an operation on the basis of the main operation information, the sub display control unit performs a control operation of not displaying, among the items which the sub display control unit causes the sub display unit to currently display, both the item related to an item to which an operation is being received by the main operation unit, and the item to which a function needing a change in display performed by the main display unit is assigned.