In a structure in which a sound processing apparatus generates processed data by executing sound processing on processing object data received from a terminal apparatus and transmits it to the terminal apparatus, the number of times of communication between the terminal apparatus and the sound processing apparatus is reduced, and a delay in acquisition of the processed data by the terminal apparatus is reduced. A reception part successively receives a processing request including processing object data from the terminal apparatus. A sound processing part execute the sound processing on the processing object data to generate the processed data. A response generation part generates a response notification including the processed data as a response to the processing request. A transmission part successively transmits the response notification to the terminal apparatus.