An operating device comprising: an image obtaining circuit having a structure adapted to obtain a reference image by photographing an object with a first camera while a vehicle travels and to obtain a comparative image by photographing the object with a second camera at the same time as the first camera obtains the reference image while the vehicle travels, the first camera fixed to the vehicle and having exterior orientation parameters with respect to the vehicle, which are determined, and the second camera fixed to the vehicle and having exterior orientation parameters with respect to the vehicle, which are undetermined; wherein the reference image and the comparative image are simultaneously photographed at multiple timings, the operating device further includes a superposition processing circuit having a structure adapted to generate a superposed reference image by superposing multiple reference images photographed at the multiple timings and to generate a superposed comparative image by superposing multiple comparative images photographed at the multiple timings, a matched point selecting circuit having a structure adapted to select points that match between the superposed reference image and the superposed comparative image, and an exterior orientation parameter calculating circuit having a structure adapted to perform relative orientation processing by generating a stereo model based on the matched points between the superposed reference image and the superposed comparative image in order to determine the relative relationships of the position and the attitude between the first camera and the second camera and to calculate the exterior orientation parameters of the second camera based on the stereo model, wherein a scale of the stereo model is adjusted in accordance with a predetermined scale. an image obtaining circuit having a structure adapted to obtain a reference image by photographing an object with a first camera while a vehicle travels and to obtain a comparative image by photographing the object with a second camera at the same time as the first camera obtains the reference image while the vehicle travels, the first camera fixed to the vehicle and having exterior orientation parameters with respect to the vehicle, which are determined, and the second camera fixed to the vehicle and having exterior orientation parameters with respect to the vehicle, which are undetermined; wherein the reference image and the comparative image are simultaneously photographed at multiple timings, the operating device further includes a superposition processing circuit having a structure adapted to generate a superposed reference image by superposing multiple reference images photographed at the multiple timings and to generate a superposed comparative image by superposing multiple comparative images photographed at the multiple timings, a matched point selecting circuit having a structure adapted to select points that match between the superposed reference image and the superposed comparative image, and an exterior orientation parameter calculating circuit having a structure adapted to perform relative orientation processing by generating a stereo model based on the matched points between the superposed reference image and the superposed comparative image in order to determine the relative relationships of the position and the attitude between the first camera and the second camera and to calculate the exterior orientation parameters of the second camera based on the stereo model, wherein a scale of the stereo model is adjusted in accordance with a predetermined scale.