Provided is a technology for controlling a contents player based on a grasping power information of a hand by measuring a change of the bundle shape of a tendons in an inside muscle of wrist, in which the device and method for controlling the contents player comprises a sensing unit that generates a grasping power information; a control state managing unit that manages a control state of the contents player; and a control order generating unit that generates a control order controlling the contents player based on the control state and the grasping power information, and transmits the control order, in which the control state can be changed or can be generates in response to the grasping power information, and the sensing unit can be existed in both hands, respectively.