1. A parking assist system comprising: an image obtaining means for obtaining an image of a view from a vehicle; a displaying means for displaying the image obtained by the image obtaining means in a monitor display provided in the vehicle; an inputting means for inputting a target parking position, at which the vehicle is parked, on the monitor display; a detecting means for detecting a relative relationship between the vehicle and the target parking position; and a judging means for judging whether or not the vehicle can be parked at the target parking position based upon the relative relationship detected by the detecting means.