The purpose of this study is to formulate routes and load of quest for objects based on visual information in urban space. First we defined signs, objects attached to buildings and articles on display as visual information and classified them into five categories. We assumed that finding out visual information of a category means finding out an object included in it and that we search visual information of the target object hierarchically in urban space. Secondly, we defined the probability of finding out objects by their visual information so as to formulate the routes and load of search for objects. The probability differs, if we remember signs and objects after we watch them once, from that if we do not. Consequently we formulate a mathematical model for determining the route of searching goods and the load of the search. Finally, we applied our model to the real urban space in Akihabara.
