To provide an operation support device and method for supporting the evading operation of its own vehicle to avoid an obstacle from the behavior information of a front vehicle.

This operation support device 10 is configured to acquire the behavior information of a front vehicle by inter-vehicle communication through a front camera 24 and communication equipment 26, and to, when deciding that the front vehicle is performing an avoiding operation to avoid an obstacle by changing a route, decide whether or not it is possible for the operator of its own vehicle to avoid the obstacle by changing the route of its own vehicle. The operation support device 10 is configured to, when it is possible for the operator of its own vehicle to avoid the obstacle by changing the route, make the operator of its own vehicle to guide the avoiding operation by a display 28 and a warning device 30, and to, when it is not possible for the operator of its own vehicle to avoid the obstacle by changing the route, make a vehicle controller 40 of its own vehicle support the avoiding operation of its own vehicle to avoid the collision with the obstacle.

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