A controller is applied to a search manipulation system that allows a user to manipulate a dial and thereby specify a search direction and a search speed when sequentially searching several display objects for a targeted display object. The controller determines that a sudden reverse manipulation occurs when the dial is reversely manipulated to reverse the search direction at a reverse manipulation speed higher than or equal to a specified speed. When determining that the sudden reverse manipulation occurs, the controller performs a search at a search speed lower than a speed used for a search during which no sudden reverse manipulation occurs.