1. An information processing method for obtaining camera parameters of an image pickup device, the method comprising the steps of: selecting at least one mode from among a plurality of obtain modes including a first obtain mode for obtaining moving images, and a second obtain mode for obtaining at least one still image; obtaining the image from the selected mode; extracting markers included in the image, which is obtained through said image obtaining step; and determining camera parameters of said image pickup device by using image coordinates of said markers extracted in said marker extracting step.