A robot and crane cooperative work system, comprising: a robot including a hand and an arm which are capable of treating a workpiece including an engagement section, or to which a tool is mountable, the robot further including an engagement section, and a camera mounted to the hand or the arm, and; a crane which includes a suspending unit which is engageable with the engagement section of the workpiece and the engagement section of the robot, and is configured to move an object which is the workpiece or the robot, while suspending the object by the crane, wherein the robot includes an object engagement section position obtaining section which obtains a position of the engagement section of the workpiece and a position of the engagement section of the robot; and a suspending unit position obtaining section which obtains a position of the suspending unit of the crane, wherein the object engagement section position obtaining section is configured to process an image taken by the camera to obtain the position of the engagement section of the workpiece or the position of the engagement section of the robot, and the suspending unit position obtaining section is configured to process the image taken by the camera to obtain the position of the suspending unit, wherein the hand is configured to hold the suspending unit based on the position of the suspending unit which is obtained by the suspending unit position obtaining section, and to be moved to guide the suspending unit to a position set based on the position of the engagement section of the workpiece which is obtained by the object engagement section position obtaining section, and the robot is configured to attach the suspending unit to the engagement section of the workpiece, and wherein the hand is configured to hold the suspending unit based on the position of the suspending unit which is obtained by the suspending unit position obtaining section, and to be moved to guide the suspending unit to a position set based on the position of the engagement section of the robot which is obtained by the object engagement section position obtaining section, and the robot is configured to attach the suspending unit to the engagement section of the robot, the crane being configured to move the object, and the robot being configured to process the workpiece. a robot including a hand and an arm which are capable of treating a workpiece including an engagement section, or to which a tool is mountable, the robot further including an engagement section, and a camera mounted to the hand or the arm, and; a crane which includes a suspending unit which is engageable with the engagement section of the workpiece and the engagement section of the robot, and is configured to move an object which is the workpiece or the robot, while suspending the object by the crane, wherein the robot includes an object engagement section position obtaining section which obtains a position of the engagement section of the workpiece and a position of the engagement section of the robot; and a suspending unit position obtaining section which obtains a position of the suspending unit of the crane, wherein the object engagement section position obtaining section is configured to process an image taken by the camera to obtain the position of the engagement section of the workpiece or the position of the engagement section of the robot, and the suspending unit position obtaining section is configured to process the image taken by the camera to obtain the position of the suspending unit, wherein the hand is configured to hold the suspending unit based on the position of the suspending unit which is obtained by the suspending unit position obtaining section, and to be moved to guide the suspending unit to a position set based on the position of the engagement section of the workpiece which is obtained by the object engagement section position obtaining section, and the robot is configured to attach the suspending unit to the engagement section of the workpiece, and wherein the hand is configured to hold the suspending unit based on the position of the suspending unit which is obtained by the suspending unit position obtaining section, and to be moved to guide the suspending unit to a position set based on the position of the engagement section of the robot which is obtained by the object engagement section position obtaining section, and the robot is configured to attach the suspending unit to the engagement section of the robot, the crane being configured to move the object, and the robot being configured to process the workpiece.