It is an object of the invention to realize automatic video generation displaying in an easily understandable manner the state of brush stroke as effectively maintaining immersion feeling happened by looking-around operation during reproduction of the image production of an omnidirectional image. A stroke information group is associated with valid line-of-sight information from a reproduction sequence recording the line-of-sight information and the stroke information group. The number of frames between a pair of line-of-sight information is made constant. When the line-of-sight moves from a line-of-sight A via a line-of-sight B to a line-of-sight C, the stroke information group corresponding to the line-of-sight B is reproduced in a range from “a frame of a center between the line-of-sight information A and B” to “a frame of a center between the line-of-sight information B and C”.