A parameter controller, comprising: a panel for accepting operations by a user, on which a plurality of channel strips (220, 230, 241) are arranged according to a predetermined order, and each of the channel strips having at least a control (16, 221); an assigner (11, S11) for assigning one control object among control objects (130, 150) to each of the channel strips (220, 230, 241), a parameter of the control object assigned to each channel strip being adjusted (11, S22) in accordance with a manipulation of the control of the channel strip by a user; and a display controller (11, S13) for controlling a display unit (15, 250) to display parameters of the control objects assigned to a first series of channel strips continuously arranged on the panel extracted from the channel strips (220, 230, 241) arranged on the panel according to the order, wherein, on accepting a first operation from the user, the display controller is configured to extract a second series of channel strips continuously arranged on the panel from the channel strips (220, 230, 241), the second series of channel strips being different from the first series of channel strips, and to control the display unit to display parameters of the control objects assigned to the second series of channel strips (11, S33) while keeping the assignment of control objects to the channel strips, wherein the plurality of channel strips (220, 230, 241) includes first channel strips and second channel strips (230, 241), the assigner being configured to assign control objects to the first channel strips in accordance with a second operation by the user, and the assigner being configured to statically assign control objects to the second channel strips (230, 241), the statically assigned control objects being not changeable by the user, wherein when the control objects of the first channel strips are changed in accordance with the second operation by the user (11, S11), the display controller is configured to control the display unit to display the parameters of the control objects assigned to the extracted one of the first series of channel strips and the second series of channel strips (220, 230, 241) after the change (11, S13), wherein a whole range of channel strips that have assigned control objects and from which the first series of channel strips and the second series of channel strips are extracted is wider than a view range of extracted series of channel strips (11, S33), and wherein the view range can be arbitrarily moved around the whole range in accordance with the first operation from the user, the first operation being a scroll operation. a panel for accepting operations by a user, on which a plurality of channel strips (220, 230, 241) are arranged according to a predetermined order, and each of the channel strips having at least a control (16, 221); an assigner (11, S11) for assigning one control object among control objects (130, 150) to each of the channel strips (220, 230, 241), a parameter of the control object assigned to each channel strip being adjusted (11, S22) in accordance with a manipulation of the control of the channel strip by a user; and a display controller (11, S13) for controlling a display unit (15, 250) to display parameters of the control objects assigned to a first series of channel strips continuously arranged on the panel extracted from the channel strips (220, 230, 241) arranged on the panel according to the order, wherein, on accepting a first operation from the user, the display controller is configured to extract a second series of channel strips continuously arranged on the panel from the channel strips (220, 230, 241), the second series of channel strips being different from the first series of channel strips, and to control the display unit to display parameters of the control objects assigned to the second series of channel strips (11, S33) while keeping the assignment of control objects to the channel strips, wherein the plurality of channel strips (220, 230, 241) includes first channel strips and second channel strips (230, 241), the assigner being configured to assign control objects to the first channel strips in accordance with a second operation by the user, and the assigner being configured to statically assign control objects to the second channel strips (230, 241), the statically assigned control objects being not changeable by the user, wherein when the control objects of the first channel strips are changed in accordance with the second operation by the user (11, S11), the display controller is configured to control the display unit to display the parameters of the control objects assigned to the extracted one of the first series of channel strips and the second series of channel strips (220, 230, 241) after the change (11, S13), wherein a whole range of channel strips that have assigned control objects and from which the first series of channel strips and the second series of channel strips are extracted is wider than a view range of extracted series of channel strips (11, S33), and wherein the view range can be arbitrarily moved around the whole range in accordance with the first operation from the user, the first operation being a scroll operation.