In order to set in advance, for each scene, setting data that should belong to (or should not belong to) a recall range, a predetermined recall setting window is displayed for a current data set representing current settings of a mixing system. Buttons in a parameter selection section correspond to parameters of each channels belonging to the current data set, and the buttons can turned on and off. When the current data set is to be recorded as a scene data set, settings of the recall setting window are also stored as part of the current data set. When the scene is to be recalled, only setting data of parameters, having been set as data belonging to the recall range, are recalled. Also, editing of a channel name is permitted in order to perform optimal name display for channel strips of the system in accordance with a form of use of the system.