Abstract: It is provided a sound/video generation system, comprising: a mobile terminal including a motion detection unit and to be installed on a motion subject; and a sound/video generator including a communication unit coupled to the mobile terminal in a wireless manner, the mobile terminal including a calculation unit configured to add absolute values of magnitudes of data on a motion in directions of three axes substantially orthogonal to one another, which is detected by the motion detection unit, the sound/video generation system comprising a judgment unit configured to determine whether or not a predetermined amount of motion is detected based on a result of calculation by the calculation unit, the sound/video generator including a sound/video generation unit configured to generate at least one of a sound or a video in accordance with a result of determination by the judgment unit.