An image processing apparatus converts an interlaced signal including a signal converted so as to be matched to a frame rate of an input video signal with original images arranged on a basis of a predetermined sequence as the video signal into a progressive signal. A coating mass is introduced into the partial cavity and the coating mass is curedcross-linked. The method includes acts which are performed sequentially: starting the gap servo with the gap being set larger than when optical recording andor reproduction is performed, and shifting the focal point to an optical recording medium side from the bottom surface of the SIL, starting the tilt servo, and setting the gap smaller and arranging the SIL at a predetermined position. When a system containing the requested file connects to the service, the requested file is retrieved from that system and then distributed to the other systems which had requested the file.