A method is for managing connections on a conference bridge. The inkjet printing apparatus detects the position of both ends of the test pattern. The first, second and third bays each have energy absorbing structures with first, second and third impact strengths respectively. One or more indications of the interference distribution may be received and used to make the determination. When the image inverting process is performed, an adjustment value, with a sign different from that in the misregistration direction in a coordinate system where the image is not inverted, is input by an operation on the display screen.