A control apparatus comprising: a controlled-object selecting switch configured to select a specified object to be controlled from a plurality of objects to be controlled and switch the object to be controlled to the selected one; an adjustment-value changing operation unit consisting of an adjustment-value changing lever configured to change an adjustment value indicating an adjustment amount for each of the plurality of objects to be controlled; a control unit configured to make the selected specified object to be controlled adjust the adjustment amount by transmitting, to the selected specified object to be controlled, an adjustment-value changing command for adjusting the adjustment amount to the one indicated by the adjustment value; a storage unit configured to store, when the object to be controlled is switched from the specified object to be controlled to an object to be controlled other than the specified object to be controlled by the controlled-object selecting switch , a pre-switching adjustment value indicating the adjustment amount before the switching of the specified object to be controlled; an indicator configured to indicate a position of the adjustment-value changing lever indicating the pre-switching adjustment value; and wherein when the object to be controlled is switched from the object to be controlled other than the specified object to be controlled to the specified object to be controlled by the controlled-object selecting switch , the control unit starts, after the adjustment-value changing lever has been moved by a user to match the position indicated by the indicator indicating the pre-switching adjustment value, transmitting the adjustment-value changing command to the specified object to be controlled, and thereby makes the specified object to be controlled adjust the adjustment amount to the one indicated by the adjustment value. a controlled-object selecting switch configured to select a specified object to be controlled from a plurality of objects to be controlled and switch the object to be controlled to the selected one; an adjustment-value changing operation unit consisting of an adjustment-value changing lever configured to change an adjustment value indicating an adjustment amount for each of the plurality of objects to be controlled; a control unit configured to make the selected specified object to be controlled adjust the adjustment amount by transmitting, to the selected specified object to be controlled, an adjustment-value changing command for adjusting the adjustment amount to the one indicated by the adjustment value; a storage unit configured to store, when the object to be controlled is switched from the specified object to be controlled to an object to be controlled other than the specified object to be controlled by the controlled-object selecting switch , a pre-switching adjustment value indicating the adjustment amount before the switching of the specified object to be controlled; an indicator configured to indicate a position of the adjustment-value changing lever indicating the pre-switching adjustment value; and wherein when the object to be controlled is switched from the object to be controlled other than the specified object to be controlled to the specified object to be controlled by the controlled-object selecting switch , the control unit starts, after the adjustment-value changing lever has been moved by a user to match the position indicated by the indicator indicating the pre-switching adjustment value, transmitting the adjustment-value changing command to the specified object to be controlled, and thereby makes the specified object to be controlled adjust the adjustment amount to the one indicated by the adjustment value. <EOS>