1. An information retrieving system comprising: a retrieval key indicating section with which a user indicates a plurality of retrieval keys; a feature vector extracting section for extracting elements of feature vector that correspond to the retrieval keys, respectively; a retrieval feature vector selecting section that compares averages of distances between corresponding elements of the feature vector, and selects a prescribed number of elements in an average distance ascending order as retrieval feature vector to be used in retrieval; a retrieving section that retrieves information stored in an information storing section by using the retrieval feature vector as retrieval executing keys; an arrangement feature vector selecting section that selects the elements of the feature vector that have not been extracted as the elements of retrieval feature vector as the elements of arrangement feature vector among the elements of the feature vectors of each retrieval key; an arranging section that classifies and arranges results of the retrieval by using the arrangement feature vector as features of the arrangement; and a display section that displays a result of the arrangement.