Airbag system for vehicle

An airbag system for a vehicle includes: a plurality of airbag modules disposed at a roof of a vehicle, allowing a cushion to be deployed toward an indoor space of the vehicle when deployed, and arranged to correspond to respective seats of the vehicle; at least one actuator configured to move an airbag module of the plurality of airbag modules in a longitudinal or lateral direction of the vehicle and to rotate the airbag module in place; and a controller controlling the at least one actuator to move the airbag module corresponding to a matched seat of the vehicle when a position of a seat or a reclined angle of a seatback is changed, and to rotate the airbag module when an orientation angle of the seat is changed, and to control the cushion of the airbag module to be deployed when a vehicle collision occurs.