A method for generating virtual and real composite image data includes: acquiring captured image data capturing an image of a real space as seen from a user's point of view; inputting the captured image data into a trained model, the training model outputting segmentation data segmenting the captured image data into a first region in which a target object is displayed, a second region in which at least a part of the user's body is displayed, and a third region that is other than the first and second regions; and compositing data of the first region and data of the second region with a virtual space image data based on the segmentation data.