Abstract: A Mixed Reality display system and others capable of experiencing Mixed Reality by changing own line of sight of a user in a case where a plurality of users experience a synthesized image are provided. The Mixed Reality display system is a system in which an image providing server and a plurality of client terminals are constructed to be capable of being communicated with each other, the image providing server represents a virtual object, synthesizes the represented object and an omnidirectional image taken by an omnidirectional image obtaining camera, and then delivers the synthesized image information to a plurality of client terminals. The client terminal extracts a partial area image from the synthesized image indicated by the synthesized image information received from the image providing server based on the portion/pose information defining the line of sight of a user observing the client terminal, and then displayed the extracted image.