A vehicle surrounding information device, method and computer program product

An existing-area calculating device (6) of a vehicle surrounding information device (1) calculates an existing area where a hidden obstacle approaching an own vehicle (A) is likely to exist, based on own-vehicle traveling information detected by an own-vehicle traveling information detecting device (2) and information of a hidden obstacle of another-vehicle obstacle information detected by an another-vehicle obstacle detecting device (11). Then, an information device (7) informs about the existing area of the hidden obstacle. Accordingly, the passenger (driver) can surely recognize the existence of the hidden obstacle to take any proper action to avoid a possible collision with the hidden obstacle, thereby improving the reliability of the vehicle surrounding information device.