A sound processing apparatus that communicates with a terminal apparatus through a communication network, includes: a main storage device; an auxiliary storage device that stores a management program and a sound processing program; a management element being implemented by making the management program resident in the main storage device, the management element that receives audio data transmitted from the terminal apparatus by a streaming method and that stores the received audio data in the main storage device, the management element that acquires, from the main storage device, processed data generated by performing sound processing on the audio data and that transmits the processed data to the terminal apparatus by a streaming method; and a sound processing element being implemented by making the sound processing program resident in the main storage device, the sound processing element that performs the sound processing on the audio data to generate the processed data when the management element stores the audio data in the main storage device and that stores the generated processed data in the main storage device.