A two-dimensional radiation display device which receives a radiation detection signal from an array of a plurality of radiation detectors arranged in a two-dimensional manner and is able to output display data for displaying a radiation distribution on a basis of the radiation detection signal, the two-dimensional radiation display device comprising: a data acquisition unit configured to convert the radiation detection signal detected multiple times from the plurality of radiation detectors to two-dimensional radiation data corresponding to positions in the array; the two-dimensional radiation display device further comprises: a data division processing unit (2, 21) configured to divide the two-dimensional radiation data converted by the data acquisition unit into a plurality of regions (102 U, 102D, 102L, 102R, 1021, 1020, 102Ua, 102Ub 102Da, 102Db, 102La, 102Lb, 102Ra, 102Rb, 1021, 102Ia, 102Ib, 1020a) sectioned in a manner to specify radiation detection directions characterized in that the data division processing unit is further configured to generate a first divided data having a first set of regions, and a second divided data having a second set of regions, the regions of the second set of regions being different from any of the regions of the first set of regions; a first integration processing unit configured to integrate the first divided data for each of the regions divided by the data division processing unit (2, 21); a second integration processing unit configured to integrate the second divided data for each of the regions divided by the data division processing unit (2, 21); a data synthesis processing unit configured to synthesize two-dimensional data representing a radiation distribution on a basis of an integrated value of each of the regions integrated by the first and second integration processing units (3a, 3b); and an image output unit configured to output the two-dimensional data synthesized by the data synthesis processing unit as display data according to a predetermined display format. a data acquisition unit configured to convert the radiation detection signal detected multiple times from the plurality of radiation detectors to two-dimensional radiation data corresponding to positions in the array; the two-dimensional radiation display device further comprises: a data division processing unit (2, 21) configured to divide the two-dimensional radiation data converted by the data acquisition unit into a plurality of regions (102 U, 102D, 102L, 102R, 1021, 1020, 102Ua, 102Ub 102Da, 102Db, 102La, 102Lb, 102Ra, 102Rb, 1021, 102Ia, 102Ib, 1020a) sectioned in a manner to specify radiation detection directions characterized in that the data division processing unit is further configured to generate a first divided data having a first set of regions, and a second divided data having a second set of regions, the regions of the second set of regions being different from any of the regions of the first set of regions; a first integration processing unit configured to integrate the first divided data for each of the regions divided by the data division processing unit (2, 21); a second integration processing unit configured to integrate the second divided data for each of the regions divided by the data division processing unit (2, 21); a data synthesis processing unit configured to synthesize two-dimensional data representing a radiation distribution on a basis of an integrated value of each of the regions integrated by the first and second integration processing units (3a, 3b); and an image output unit configured to output the two-dimensional data synthesized by the data synthesis processing unit as display data according to a predetermined display format. a data division processing unit (2, 21) configured to divide the two-dimensional radiation data converted by the data acquisition unit into a plurality of regions (102 U, 102D, 102L, 102R, 1021, 1020, 102Ua, 102Ub 102Da, 102Db, 102La, 102Lb, 102Ra, 102Rb, 1021, 102Ia, 102Ib, 1020a) sectioned in a manner to specify radiation detection directions characterized in that the data division processing unit is further configured to generate a first divided data having a first set of regions, and a second divided data having a second set of regions, the regions of the second set of regions being different from any of the regions of the first set of regions; a first integration processing unit configured to integrate the first divided data for each of the regions divided by the data division processing unit (2, 21); a second integration processing unit configured to integrate the second divided data for each of the regions divided by the data division processing unit (2, 21); a data synthesis processing unit configured to synthesize two-dimensional data representing a radiation distribution on a basis of an integrated value of each of the regions integrated by the first and second integration processing units (3a, 3b); and an image output unit configured to output the two-dimensional data synthesized by the data synthesis processing unit as display data according to a predetermined display format.