When controlling values of a plurality of parameters in a predetermined device according to an operation by a user, values of parameters to be controlled are displayed in an array along an item axis on a parameter editing screen, an operation by the user to the parameter editing screen is detected, and when an operation to trace the screen in a direction of the item axis from a certain position is detected, a sequential control is performed, sequentially according to progress of the operation, to temporarily change to a specific value a value of each parameter corresponding to a position in the item axis direction where the trace operation is being performed.