A server sends to a client a message instructing movement of a display apparatus so that cameras comprising a view for creating a three-dimensional model can shoot a screen of a display apparatus. After movement is complete, the server causes an imaging parameter computation pattern image to be displayed on the screen of the display apparatus and instructs the client to cause the displayed pattern image to be shot by cameras. The server acquires images shot by the cameras from the client and seeks imaging parameters of the cameras on the basis of the pattern image included in the acquired images.