A vehicle device, comprising: a video acquisition unit configured to acquire videos captured by cameras (11, 11-1, 11-2,11-3, 11-4) configured to capture surroundings of a vehicle; a light emission controller configured to control light emission of a light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) which is emitted by light emitting devices (14, 14-1, 14-2, 14-3, 14-4) and with which the ground or a floor surface is irradiated at predetermined positions (α-1, α-2, α-3, α-4) with respect to the vehicle; an image processing unit configured to generate, using the videos acquired by the video acquisition unit, a bird's-eye view video including the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) the light emission of which is controlled by the light emission controller; and a superimposing image generation unit configured to generate a superimposing image included in the bird's-eye view video generated by the image processing unit wherein a position of the superimposing image in the bird's-eye view video corresponds to a position of the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) when the camera parameters used for generating the bird's-eye view video are correctly calibrated, wherein the image processing unit is further configured to superimpose the superimposing image generated by the superimposing image generation unit on the bird's-eye view video, and the vehicle device further comprises an image determination processing unit configured to detect, in the bird's-eye view video on which the superimposing image generated by the superimposing image generation unit is superimposed by the image processing unit, an overlapping portion of the superimposing image and the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) included in the bird's-eye view video to determine whether camera parameters for generating the bird's-eye view video are accurately calibrated. a video acquisition unit configured to acquire videos captured by cameras (11, 11-1, 11-2,11-3, 11-4) configured to capture surroundings of a vehicle; a light emission controller configured to control light emission of a light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) which is emitted by light emitting devices (14, 14-1, 14-2, 14-3, 14-4) and with which the ground or a floor surface is irradiated at predetermined positions (α-1, α-2, α-3, α-4) with respect to the vehicle; an image processing unit configured to generate, using the videos acquired by the video acquisition unit, a bird's-eye view video including the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) the light emission of which is controlled by the light emission controller; and a superimposing image generation unit configured to generate a superimposing image included in the bird's-eye view video generated by the image processing unit wherein a position of the superimposing image in the bird's-eye view video corresponds to a position of the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) when the camera parameters used for generating the bird's-eye view video are correctly calibrated, wherein the image processing unit is further configured to superimpose the superimposing image generated by the superimposing image generation unit on the bird's-eye view video, and the vehicle device further comprises an image determination processing unit configured to detect, in the bird's-eye view video on which the superimposing image generated by the superimposing image generation unit is superimposed by the image processing unit, an overlapping portion of the superimposing image and the light beam pattern (42, a, b-1, b-2, c-1, c-2, c-3, c-4) included in the bird's-eye view video to determine whether camera parameters for generating the bird's-eye view video are accurately calibrated.