A digital signage system comprising: a plurality of display devices (2230, 2260, 2270) comprising at least a first display device and a second display device for displaying signage contents; and a server (110, 300) including: a communication unit (140, 310) configured to transmit signage content data to each of the display devices (2230, 2260, 2270), a sensor unit configured to sense an up and down movement, a left and right movement or a rotation movement of at least one of the first and second display devices (2230, 2260, 2270), and a controller (230, 380) configured to: separately control each of the first and second display devices (2230, 2260, 2270) of which display areas are overlapped with each other on the basis of the sensed movement data of the at least one display device (2230, 2260, 2270) when a user is located at a reference point, if display areas of at least two of the plurality of display devices (2230, 2260, 2270) are overlapped with each other at a predetermined threshold surface area value or more, control the first display device to display at least one object of the signage content by fixing an absolute position of an image displayed on the first display device and differently display another object on the basis of the sensed movement data, and control the second display device to perform a light shielding function. a plurality of display devices (2230, 2260, 2270) comprising at least a first display device and a second display device for displaying signage contents; and a server (110, 300) including: a communication unit (140, 310) configured to transmit signage content data to each of the display devices (2230, 2260, 2270), a sensor unit configured to sense an up and down movement, a left and right movement or a rotation movement of at least one of the first and second display devices (2230, 2260, 2270), and a controller (230, 380) configured to: separately control each of the first and second display devices (2230, 2260, 2270) of which display areas are overlapped with each other on the basis of the sensed movement data of the at least one display device (2230, 2260, 2270) when a user is located at a reference point, if display areas of at least two of the plurality of display devices (2230, 2260, 2270) are overlapped with each other at a predetermined threshold surface area value or more, control the first display device to display at least one object of the signage content by fixing an absolute position of an image displayed on the first display device and differently display another object on the basis of the sensed movement data, and control the second display device to perform a light shielding function. a communication unit (140, 310) configured to transmit signage content data to each of the display devices (2230, 2260, 2270), a sensor unit configured to sense an up and down movement, a left and right movement or a rotation movement of at least one of the first and second display devices (2230, 2260, 2270), and a controller (230, 380) configured to: separately control each of the first and second display devices (2230, 2260, 2270) of which display areas are overlapped with each other on the basis of the sensed movement data of the at least one display device (2230, 2260, 2270) when a user is located at a reference point, if display areas of at least two of the plurality of display devices (2230, 2260, 2270) are overlapped with each other at a predetermined threshold surface area value or more, control the first display device to display at least one object of the signage content by fixing an absolute position of an image displayed on the first display device and differently display another object on the basis of the sensed movement data, and control the second display device to perform a light shielding function. separately control each of the first and second display devices (2230, 2260, 2270) of which display areas are overlapped with each other on the basis of the sensed movement data of the at least one display device (2230, 2260, 2270) when a user is located at a reference point, if display areas of at least two of the plurality of display devices (2230, 2260, 2270) are overlapped with each other at a predetermined threshold surface area value or more, control the first display device to display at least one object of the signage content by fixing an absolute position of an image displayed on the first display device and differently display another object on the basis of the sensed movement data, and control the second display device to perform a light shielding function.