In the case where an operating state of an internal combustion engine belongs to a filter forced recovery region, filter forced recovery is performed when an amount of particulate matter deposited in a filter becomes equal to or larger than a predetermined amount. The method includes: an image forming step of forming the image based on the application; and a display control step of controlling a process for displaying the image so that a portion corresponding to the inside of the recording medium of the image formed in the image forming step and a portion corresponding to the outside of the recording medium can be discriminated. Top surfaces of pin contact portions are within the through-holes so that pins can be inserted into through-holes above the pin contact portions. The damping structure exerts force on the distal end of the actuator with the force being used toward stopping rotation of the actuator. The lower layer has a plurality of through holes receiving respective cleats for insertion thereinto.