1. An information processing method applied to an information processing device in which a 3D map and a spatial topological structure management-based feature library created in advance for a certain environment is contained, and different users in the certain environment are able to determine their location in accordance with images taken by themselves and the feature library, the method comprising: acquiring a first image taken by a first user; extracting one or more first feature points in the first image to obtain first feature descriptors for characterizing the first feature points; obtaining 3D locations of the first feature points based on a 3D location of the first user, the first image, and the feature library; determining feature descriptors to be updated based on the 3D location of the first user, the 3D locations of the first feature points, the first feature descriptors corresponding to the first feature points, and existing feature descriptors in the feature library; and updating the feature library based on the feature descriptors to be updated.