The present invention relates to an input/output device provided in a vehicle, the device including a plurality of sticks arranged in columns in a first direction and rows in a second direction, a driving unit configured to move at least one of the sticks in a direction perpendicular to the first and second directions, and a processor configured to control the driving unit such that the sticks have the same height or different heights from a reference plane defined by the first and second directions, wherein the processor controls the driving unit so that one or more buttons defined by a height difference of the sticks are formed, based on a driving state of the vehicle, and wherein the one or more buttons are varied according to the driving state of the vehicle.