A display apparatus , comprising: a display panel which comprises a plurality of sub display panels (D) arranged in an array, wherein the plurality of sub display panels (D) are connected by a display channel to form a first topology and are also connected by an information channel according to a predetermined second topology; wherein the first topology is a form of connecting the display channel among the sub display panels and the second topology is a form of connecting the information channel among the sub display panels; wherein the sub display panels (D) are connected in a sequential order through the display channel; and a detecting device configured to obtain basic information of the display panel and determine the first topology according to the basic information and the second topology, wherein the detecting device comprises an information extracting module and a detecting module , wherein the information extracting module is configured to obtain the basic information of the display panel , and to read, through the information channel, data of a testing image received by each of the plurality of sub display panels (D), wherein said basic information includes resolution of the display panel and resolution of each of the plurality of sub display panels (D), wherein all of the plurality of sub display panels have the same resolution; and the detecting module is configured to generate the testing image according to the basic information of the display panel , provide the testing image to the plurality of sub display panels (D) of the display panel through the display channel, and determine the first topology according to the second topology and the data of the testing image received by each of the plurality of sub display panels (D) and provided by the information extracting module , wherein the testing image carries information which is different corresponding to different locations of sub display panels (D) in the display panel . a display panel which comprises a plurality of sub display panels (D) arranged in an array, wherein the plurality of sub display panels (D) are connected by a display channel to form a first topology and are also connected by an information channel according to a predetermined second topology; wherein the first topology is a form of connecting the display channel among the sub display panels and the second topology is a form of connecting the information channel among the sub display panels; wherein the sub display panels (D) are connected in a sequential order through the display channel; and a detecting device configured to obtain basic information of the display panel and determine the first topology according to the basic information and the second topology, wherein the detecting device comprises an information extracting module and a detecting module , wherein the information extracting module is configured to obtain the basic information of the display panel , and to read, through the information channel, data of a testing image received by each of the plurality of sub display panels (D), wherein said basic information includes resolution of the display panel and resolution of each of the plurality of sub display panels (D), wherein all of the plurality of sub display panels have the same resolution; and the detecting module is configured to generate the testing image according to the basic information of the display panel , provide the testing image to the plurality of sub display panels (D) of the display panel through the display channel, and determine the first topology according to the second topology and the data of the testing image received by each of the plurality of sub display panels (D) and provided by the information extracting module , wherein the testing image carries information which is different corresponding to different locations of sub display panels (D) in the display panel . <EOS>