SEAT SYSTEM

Provided is a seat system which can change a surrounding environment of a user including illumination according to the movement of the user's body. A seat system comprises a seat body on which a user can be seated; a plurality of sensors provided on or in the seat body or on a structure arranged around the seat body and configured to detect a touch operation by the user seated on the seat body; an output device configured to output at least one of sound, light, and vibration; and a control device configured to control the output device such that, when one or more of the sensors detect a touch operation, the control device causes the output device to generate a corresponding predetermined output.