Mobile apparatuses capable of moving or acting autonomously, without contacting each other, in an environment where movements of the mobile apparatuses are not managed by a server, are provided. In a robot functioning as a first mobile apparatus, it is recognized that an object corresponds to a second mobile apparatus, and based on this recognition, a target trajectory is searched for and determined. Further, the first mobile apparatus causes another robot functioning as the second mobile apparatus to recognize a part or a whole of the target trajectory. In the second mobile apparatus, the part or the whole of the target trajectory of the first mobile apparatus is recognized, and based on this recognition, a target trajectory that the second mobile apparatus should follow is searched for and determined. This allows the mobile apparatuses to move along their respective target trajectories to avoid contact with each other.