1. An in-vehicle image display apparatus for use in a vehicle, comprising: a state detecting device that detects a state of surroundings of the vehicle; a display device that is provided at least in a window section of the vehicle and capable of displaying information over the window section; an image generating device that generates image data representing an image of the surroundings of the vehicle based on detection results from the state detecting device; a display control device that makes the display device display the image represented by the image data generated by the image generating device; and a storage device that previously stores data representing an object to be detected which is detected by the state detecting device in the surroundings of the vehicle, wherein the image generating device compares the image data generated based on detection results from the state detecting device and the data stored in the storage device, and uses data of an object to be detected that is determined to be similar to the object to be detected which is represented by the image data generated by the image generating device itself, among objects to be detected which are represented by the data stored in the storage device, to thereby generate image data representing the image of the surroundings of the vehicle.