Patent ID: 7330554

Claim:
A volume control apparatus of a sound output system, the apparatus comprising: a memory in which sound increase/decrease interval information that a user inputs is stored; a command and information input unit that inputs the sound increase/decrease interval information and a volume control signal with respect to sound output from the sound output system; a sound output unit that outputs sound generated in the sound output system to an outside of the sound output system; and a system control unit that stores the sound increase/decrease interval information input from the command and information input unit in the memory and controls the sound output unit such that sound output from the sound output unit is increased/decreased on a basis of the sound increase/decrease interval information stored in the memory when the volume control signal is received, wherein if the sound increase/decrease interval information is input from the command and information input unit, the system control unit stores the sound increase/decrease interval information in the memory when the sound increase/decrease interval is greater than a minimum increase/decrease interval set in the sound output system and less than a maximum increase/decrease interval set in the sound output system.