Lamp system of mobile body and control method thereof

A lamp system of a mobile body is disclosed. The system includes an optical module positioned on the mobile body, and a processor to receive a relative position coordinate value of a following mobile body, control the optical module based on the received relative position coordinate value of the following mobile body, and control light quantity emitted by the optical module based on the received relative position coordinate value in response to the following mobile body being within a predetermined range area relative to the mobile body.