To perform marketing by using a display system 100 on which a virtual object V is displayed.SOLUTION: There is provided a customer grasping system comprising: a storage part 720 that stores personal information that is input when application software 440 for displaying a virtual object of a building superimposed on a real space displayed on a display part 460 of a terminal 400 is installed in the terminal 400 or activated; and a specification part 740 that specifies a place at which the application software 440 is activated.SELECTED DRAWING: Figure 4
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