A plurality of autonomous mobile robots, comprising: a first mobile robot including a plurality of transmitting optical sensors for outputting light, and a first module for transmitting and receiving an Ultra-Wideband (UWB) signal; and a second mobile robot including a plurality of receiving optical sensors for receiving light, and a second module for transmitting and receiving the UWB signal, the second mobile robot comprising a control unit configured to determine an angle at which the first mobile robot is located with respect to a front of the second mobile robot by using the light, and determine a distance from the second mobile robot to the first mobile robot by using the UWB signal; and the control unit of the second mobile robot being further configured to determine a relative position of the first mobile robot based on the angle and the distance; and wherein the control unit of the second mobile robot is configured: - to determine a direction that the first mobile robot faces with respect to the front of the second mobile robot , based on a type of a receiving optical sensor, which has received light, among the plurality of receiving optical sensors and an attribute of the light received through the receiving optical sensor; or - to determine a direction that the second mobile robot faces with respect to the front of the first mobile robot , based on a type of a receiving optical sensor, which has received light, among the plurality of receiving optical sensors and an attribute of the light received through the receiving optical sensor. a first mobile robot including a plurality of transmitting optical sensors for outputting light, and a first module for transmitting and receiving an Ultra-Wideband (UWB) signal; and a second mobile robot including a plurality of receiving optical sensors for receiving light, and a second module for transmitting and receiving the UWB signal, the second mobile robot comprising a control unit configured to determine an angle at which the first mobile robot is located with respect to a front of the second mobile robot by using the light, and determine a distance from the second mobile robot to the first mobile robot by using the UWB signal; and the control unit of the second mobile robot being further configured to determine a relative position of the first mobile robot based on the angle and the distance; and wherein the control unit of the second mobile robot is configured: - to determine a direction that the first mobile robot faces with respect to the front of the second mobile robot , based on a type of a receiving optical sensor, which has received light, among the plurality of receiving optical sensors and an attribute of the light received through the receiving optical sensor; or - to determine a direction that the second mobile robot faces with respect to the front of the first mobile robot , based on a type of a receiving optical sensor, which has received light, among the plurality of receiving optical sensors and an attribute of the light received through the receiving optical sensor. - to determine a direction that the first mobile robot faces with respect to the front of the second mobile robot , based on a type of a receiving optical sensor, which has received light, among the plurality of receiving optical sensors and an attribute of the light received through the receiving optical sensor; or - to determine a direction that the second mobile robot faces with respect to the front of the first mobile robot , based on a type of a receiving optical sensor, which has received light, among the plurality of receiving optical sensors and an attribute of the light received through the receiving optical sensor. <EOS>