An image display system comprising a display apparatus (1, 40) and a plurality of image pickup apparatuses ( 1, 30) each attached to a moving body to execute image pickup, each of said plurality of image pickup apparatuses ( 1, 30) including: an image pickup means configured to execute image pickup, a communication means configured to execute data communication with a display apparatus ( 1, 40), and a control means configured to execute transmission control processing for making said communication means transmit image data obtained by image pick up of the image pickup means to said display apparatus (1, 40) in response to an image request received from the display apparatus (1, 40) for sending an image to the display apparatus (1, 40), wherein said control means is configured to send a communication clear request to the display apparatus (1, 40), if a release of the communication is requested by a user of the image pickup apparatus (1, 30), and said display apparatus ( 1, 40) including: a display means configured to execute image display, a communication means configured to execute data communication with each of the plurality of image pickup apparatuses (1, 30), and a control means configured to execute specification processing for setting specification information for specifying a particular image pickup apparatus ( 1, 30) among the plurality of image pickup apparatuses (1, 30) to perform image request transmission processing for transmitting from said communication means the image request to the particular image pickup apparatus ( 1, 30) to be specified on the basis of said specification information and to perform display processing of image data received through said communication means and which are transmitted from said particular image pickup apparatus (1, 30) in response to said image request and to make said display means execute a display operation based on the received image data, wherein said specification information is information indicative of the type of a moving body. an image pickup means configured to execute image pickup, a communication means configured to execute data communication with a display apparatus ( 1, 40), and a control means configured to execute transmission control processing for making said communication means transmit image data obtained by image pick up of the image pickup means to said display apparatus (1, 40) in response to an image request received from the display apparatus (1, 40) for sending an image to the display apparatus (1, 40), wherein said control means is configured to send a communication clear request to the display apparatus (1, 40), if a release of the communication is requested by a user of the image pickup apparatus (1, 30), and a display means configured to execute image display, a communication means configured to execute data communication with each of the plurality of image pickup apparatuses (1, 30), and a control means configured to execute specification processing for setting specification information for specifying a particular image pickup apparatus ( 1, 30) among the plurality of image pickup apparatuses (1, 30) to perform image request transmission processing for transmitting from said communication means the image request to the particular image pickup apparatus ( 1, 30) to be specified on the basis of said specification information and to perform display processing of image data received through said communication means and which are transmitted from said particular image pickup apparatus (1, 30) in response to said image request and to make said display means execute a display operation based on the received image data, wherein said specification information is information indicative of the type of a moving body.