An image management system for controlling a display of a captured image, the system connected to a communication terminal through a network, the system comprising: a data exchange unit to receive, from the communication terminal, an instruction for displaying a drawn image drawn by a user on a captured image while the captured image is being displayed to the user; a generation unit to generate an attachment image containing a drawn-image; and an attachment unit to attach the attachment image containing the drawn image to the captured image, the attachment image containing the drawn image being a planar image, characterized in that: the captured image is a full spherical panoramic image; the attachment unit is configured to attach the attachment image to the captured image on a plane normal to a straight line passing through a center of the drawn image and a reference position, the reference position representing a point of view from which a predetermined area of the captured image is within a field of view, the straight line intersecting the captured image at a first intersection point and a second intersection point, the first intersection point being farther from the reference position than the second intersection point; and the image management system further comprises a specification unit to set the plane normal to the straight line at a position that is offset along the straight line by a predetermined distance (d) from the first intersection point towards the second intersection point. a data exchange unit to receive, from the communication terminal, an instruction for displaying a drawn image drawn by a user on a captured image while the captured image is being displayed to the user; a generation unit to generate an attachment image containing a drawn-image; and an attachment unit to attach the attachment image containing the drawn image to the captured image, the attachment image containing the drawn image being a planar image, characterized in that: the captured image is a full spherical panoramic image; the attachment unit is configured to attach the attachment image to the captured image on a plane normal to a straight line passing through a center of the drawn image and a reference position, the reference position representing a point of view from which a predetermined area of the captured image is within a field of view, the straight line intersecting the captured image at a first intersection point and a second intersection point, the first intersection point being farther from the reference position than the second intersection point; and the image management system further comprises a specification unit to set the plane normal to the straight line at a position that is offset along the straight line by a predetermined distance (d) from the first intersection point towards the second intersection point. the captured image is a full spherical panoramic image; the attachment unit is configured to attach the attachment image to the captured image on a plane normal to a straight line passing through a center of the drawn image and a reference position, the reference position representing a point of view from which a predetermined area of the captured image is within a field of view, the straight line intersecting the captured image at a first intersection point and a second intersection point, the first intersection point being farther from the reference position than the second intersection point; and the image management system further comprises a specification unit to set the plane normal to the straight line at a position that is offset along the straight line by a predetermined distance (d) from the first intersection point towards the second intersection point.