Provided is a robot device and a method of controlling same. The robot device includes: at least one memory storing at least one instruction; a sensor configured to detect an environment of the robot device and output detection data; and at least one processor configured to execute the at least one instruction to: acquire a map of a space where the robot device is positioned based on the detection data received from the sensor, and a reliability value of each of a plurality of areas of the map, store the map and the reliability value of each of the plurality of areas in the at least one memory, identify at least one area having a reliability value greater than or equal to a critical value, based on the reliability value of each of the plurality of areas, and identify a movement path of the robot device in the space, based on the at least one area.