A signal processing apparatus includes one or more memories storing instructions, and one or more processors executing the instructions to acquire a sound characteristic generated by vibration depending on a real-world object with which a virtual object is in contact, in a virtual-reality display in which an image of the virtual object is superimposed and displayed on a real-world image, apply the acquired sound characteristic generated by vibration to a sound source signal of the virtual object, and reproduce a sound depending on the sound signal to which the sound characteristic generated by vibration is applied.