1. An information processing device comprising: a global map acquiring unit that acquires a part of a global map representing positions of one or more feature points on objects in a real space, wherein the global map is generated based on data from devices of a plurality of users; a local map generating unit that generates a local map representing positions of the one or more feature points on objects detectable by a first device of one user among the plurality of users, wherein the local map is generated based on data from the device of a single user; a position generation unit that generates a position of the first device of the user in the global map, based on feature points in the local map and feature points of the global map; and an updating unit that updates the global map based on the one or more feature points included in the local map, wherein the positions of feature points in the global map and the local map are defined as three-dimensional position, and wherein the global map acquiring unit, the local map generating unit, the position generation unit, and the updating unit are each implemented via at least one processor.