A user input system for controlling a viewpoint within displayed content includes a user profile obtaining unit operable to obtain a user profile having information about head motion and eye motion for a user, an input unit operable to receive user inputs relating to a change in viewpoint within displayed content, the user inputs including the user's head motion, and a viewpoint modification unit operable to modify the viewpoint in the displayed content in dependence upon received inputs and the user profile, where the modification to the viewpoint includes a greater motion than the head motion received as an input.