A mobile robot comprising: a main body configured to travel in an area; an image acquisition unit configured to capture an image; a communication unit configured to receive a position signal transmitted from a first mobile robot to follow; a control unit configured to determine a position of the first mobile robot from the image acquired by the image acquisition unit or the position signal, and set a travel route with the position of the first mobile robot as a target point; and a driving unit configured to move the main body to follow the first mobile robot along the travel route, wherein the mobile robot is configured to search for and receive the position signal of the first mobile robot, wherein the control unit is configured to receive the position signal of the first mobile robot and determine the position of the first mobile robot; wherein, when the position signal is not received, the control unit is configured to change a position calculation method, capture the acquired image and determine the position of the first mobile robot according to the position of a marker extracted from the acquired image; wherein, when failing to calculate the position of the first mobile robot from the acquired image or receive the position signal, the control unit is configured to change a position calculation method for the first mobile robot a predetermined number of times, and when failing to confirm the position of the first mobile robot after changing the position calculation method the predetermined number of times, the control unit is configured to stop following the first mobile robot and output a warning. a main body configured to travel in an area; an image acquisition unit configured to capture an image; a communication unit configured to receive a position signal transmitted from a first mobile robot to follow; a control unit configured to determine a position of the first mobile robot from the image acquired by the image acquisition unit or the position signal, and set a travel route with the position of the first mobile robot as a target point; and a driving unit configured to move the main body to follow the first mobile robot along the travel route, wherein the mobile robot is configured to search for and receive the position signal of the first mobile robot, wherein the control unit is configured to receive the position signal of the first mobile robot and determine the position of the first mobile robot; wherein, when the position signal is not received, the control unit is configured to change a position calculation method, capture the acquired image and determine the position of the first mobile robot according to the position of a marker extracted from the acquired image; wherein, when failing to calculate the position of the first mobile robot from the acquired image or receive the position signal, the control unit is configured to change a position calculation method for the first mobile robot a predetermined number of times, and when failing to confirm the position of the first mobile robot after changing the position calculation method the predetermined number of times, the control unit is configured to stop following the first mobile robot and output a warning.