A plurality of autonomous mobile robots, comprising: a first mobile robot including a plurality of transmitting optical sensors (610a, 620a, 630a, 640a, 650a, 660a) for outputting light, and a first module for transmitting and receiving an Ultra-Wideband signal; and a second mobile robot including a plurality of receiving optical sensors (610b, 620b, 630b, 640b, 650b, 660b) 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 (610b, 620b, 630b, 640b, 650b, 660b) 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 (610a, 620a, 630a, 640a, 650a, 660a) for outputting light, and a first module for transmitting and receiving an Ultra-Wideband signal; and a second mobile robot including a plurality of receiving optical sensors (610b, 620b, 630b, 640b, 650b, 660b) 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 (610b, 620b, 630b, 640b, 650b, 660b) 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 (610b, 620b, 630b, 640b, 650b, 660b) 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.