A crane information display system comprising: a first information display unit that is installed at the location where a crane is scheduled to be installed and that is configured to display information about the crane, and a terminal device that mounts a camera to obtain a camera image by imaging, with the camera, the first information display unit, wherein the terminal device comprises: a crane information acquisition unit configured to read, from the camera image, display information of the first information display unit to acquire information about the crane; a virtual crane generation unit configured to generate, on a basis of the information about the crane acquired by the crane information acquisition unit, image information about a virtual crane that corresponds to a three-dimensional image of the crane; a position/posture calculation unit configured to read, from the camera image, the display information of the first information display unit to acquire information about a reference shape of the first information display unit, and extract, from the camera image, information about an outline shape of the first information display unit that appears in the camera image, and calculate, on a basis of the reference shape of the first information display unit and the information about the outline shape of the first information display unit, a position at which the virtual crane is to be disposed and a posture to be taken by the virtual crane in the camera image; an information processing unit configured to convert the image information about the virtual crane generated by the virtual crane generation unit, into image information that corresponds to the position and the posture of the virtual crane calculated by the position/posture calculation unit; and an image display unit configured to overlay and display, onto the camera image, the virtual crane to which the processing by the information processing unit that is configured to convert the image information has been applied. a first information display unit that is installed at the location where a crane is scheduled to be installed and that is configured to display information about the crane, and a terminal device that mounts a camera to obtain a camera image by imaging, with the camera, the first information display unit, wherein the terminal device comprises: a crane information acquisition unit configured to read, from the camera image, display information of the first information display unit to acquire information about the crane; a virtual crane generation unit configured to generate, on a basis of the information about the crane acquired by the crane information acquisition unit, image information about a virtual crane that corresponds to a three-dimensional image of the crane; a position/posture calculation unit configured to read, from the camera image, the display information of the first information display unit to acquire information about a reference shape of the first information display unit, and extract, from the camera image, information about an outline shape of the first information display unit that appears in the camera image, and calculate, on a basis of the reference shape of the first information display unit and the information about the outline shape of the first information display unit, a position at which the virtual crane is to be disposed and a posture to be taken by the virtual crane in the camera image; an information processing unit configured to convert the image information about the virtual crane generated by the virtual crane generation unit, into image information that corresponds to the position and the posture of the virtual crane calculated by the position/posture calculation unit; and an image display unit configured to overlay and display, onto the camera image, the virtual crane to which the processing by the information processing unit that is configured to convert the image information has been applied. a crane information acquisition unit configured to read, from the camera image, display information of the first information display unit to acquire information about the crane; a virtual crane generation unit configured to generate, on a basis of the information about the crane acquired by the crane information acquisition unit, image information about a virtual crane that corresponds to a three-dimensional image of the crane; a position/posture calculation unit configured to read, from the camera image, the display information of the first information display unit to acquire information about a reference shape of the first information display unit, and extract, from the camera image, information about an outline shape of the first information display unit that appears in the camera image, and calculate, on a basis of the reference shape of the first information display unit and the information about the outline shape of the first information display unit, a position at which the virtual crane is to be disposed and a posture to be taken by the virtual crane in the camera image; an information processing unit configured to convert the image information about the virtual crane generated by the virtual crane generation unit, into image information that corresponds to the position and the posture of the virtual crane calculated by the position/posture calculation unit; and an image display unit configured to overlay and display, onto the camera image, the virtual crane to which the processing by the information processing unit that is configured to convert the image information has been applied.