1. An auxiliary registration apparatus for registering a display device and an image sensor, comprising: a camera; a panel which is interoperated with the camera and on which a first pattern is displayed; and a control part which allows the first pattern displayed on the panel to be shot with the image sensor and a second pattern which is a pattern displayed on a screen of the display device to be shot with the camera, by allowing locations or angles of the camera and the panel to be adjusted; wherein the control part allows information on a transformation relationship between a coordinate system of the display device and that of the image sensor to be acquired by referring to information on a transformation relationship between a coordinate system of the panel and that of the image sensor obtained by using information on the first pattern shot with the image sensor and information on a transformation relationship between a coordinate system of the camera and that of the display device obtained by using information on the second pattern shot with the camera, to thereby allow the information on the transformation relationship between the coordinate system of the display device and that of the image sensor to be used to register the display device and the image sensor.