Dummy sound generating apparatus and dummy sound generating method and corresponding computer product

A dummy sound information storage unit (101) stores information on a dummy sound, an outer generating unit (102) generates a dummy sound outside the vehicle based upon information stored in the dummy sound information storage unit (101), a detecting unit (103) detects a predetermined situation while the vehicle is running, and a control unit (104) controls an output of a dummy sound generation instruction signal to the outer generating unit (102) based upon the result detected by the detecting unit (103). As a result, a dummy sound of an engine of a vehicle can be generated based upon running conditions of the vehicle.