An image display system, comprising: a head-mounted display (300, 300A, 300B) having a capturing part for obtaining first real-world video information by capturing a real world and an image display part for displaying first video obtained by integrating the first real-world video information captured by the capturing part with first virtual-world video information; a movement information detecting part (400, 400A, 400B) for detecting movement of a body of a wearer (P, P1, P2) wearing the head-mounted display (300, 300A, 300B) as movement information; a position information detecting part for detecting position information of the wearer (P, P1, P2); wherein the image display system further comprises a capturing device configured to capture a predetermined field in which the wearer (P, P1, P2) exists to obtain second real-world video information; and an image display device for displaying second video obtained by integrating the second real-world video information obtained by the capturing device with second virtual-world video information obtained by changing the first virtual-world video information with a viewpoint of the capturing device which is different from a viewpoint of the wearer, wherein the image display system is configured to control the first virtual-world video information and the second virtual-world video information based on the movement information and the position information, wherein the position information detecting part is configured to obtain the position information of the wearer (P, P1, P2) by performing image recognition of a marker (200, 200A, 200B) arranged in a space with using the capturing part of the head-mounted display (300, 300A, 300B), the marker (200, 200A, 200B) is a three-dimensional marker utilizing solid objects in the space, the second video displayed on the image display device is different from the first video displayed on the image display part of the head-mounted display (300, 300A, 300B), and the movement information detecting part (400, 400A, 400B) which is configured to be worn on an arm of the wearer (P, P1, P2) and has an acceleration sensor for detecting an acceleration, an angular velocity sensor for detecting an angular velocity and a muscle potential sensor for detecting a muscle potential of the arm of the wearer (P, P1, P2). a head-mounted display (300, 300A, 300B) having a capturing part for obtaining first real-world video information by capturing a real world and an image display part for displaying first video obtained by integrating the first real-world video information captured by the capturing part with first virtual-world video information; a movement information detecting part (400, 400A, 400B) for detecting movement of a body of a wearer (P, P1, P2) wearing the head-mounted display (300, 300A, 300B) as movement information; a position information detecting part for detecting position information of the wearer (P, P1, P2); wherein the image display system further comprises a capturing device configured to capture a predetermined field in which the wearer (P, P1, P2) exists to obtain second real-world video information; and an image display device for displaying second video obtained by integrating the second real-world video information obtained by the capturing device with second virtual-world video information obtained by changing the first virtual-world video information with a viewpoint of the capturing device which is different from a viewpoint of the wearer, wherein the image display system is configured to control the first virtual-world video information and the second virtual-world video information based on the movement information and the position information, wherein the position information detecting part is configured to obtain the position information of the wearer (P, P1, P2) by performing image recognition of a marker (200, 200A, 200B) arranged in a space with using the capturing part of the head-mounted display (300, 300A, 300B), the marker (200, 200A, 200B) is a three-dimensional marker utilizing solid objects in the space, the second video displayed on the image display device is different from the first video displayed on the image display part of the head-mounted display (300, 300A, 300B), and the movement information detecting part (400, 400A, 400B) which is configured to be worn on an arm of the wearer (P, P1, P2) and has an acceleration sensor for detecting an acceleration, an angular velocity sensor for detecting an angular velocity and a muscle potential sensor for detecting a muscle potential of the arm of the wearer (P, P1, P2).