Patent Publication Number: US-2018036506-A1

Title: Display device, display method, and non-transitory computer-readable medium

Description:
BACKGROUND 
     Technical Field 
     The present invention relates to a display device, a display method, and a non-transitory computer-readable medium. 
     Background Art 
     A patient who has a limb missing due to an accident or the like may have a sensation that there is a pain in the missing limb. This phenomenon is called phantom limb pain. With such a patient, a method in which the patient is made to think in such a way as to move the missing limb and is also shown an image of the missing limb moving, thus causing the patient to have the illusion that the limb is moving, has been found effective. That is, it is a method in which the patient is shown an image causing the patient to have the illusion that the missing limb actually exists. With this method, the recognition of the missing limb is properly carried out in the patient&#39;s brain and the pain disappears or is relieved. 
     Also, a device which causes a patient to see as if a paralyzed hand or missing hand were moving is disclosed in PTL 1. According to this, a plurality of magnetic sensors is installed on the patient&#39;s body. Then, a predetermined magnetic field is applied to the patient and the posture of the patient is detected. Then, a dynamic image of a hand is displayed on a display device. At this point, the position, posture and size of the hand in the dynamic image are adjusted so that the patient and the hand in the dynamic image are unified together. 
     The patient views the dynamic image and has the illusion that the hand in the dynamic image is a part of the patient&#39;own body. For a patient with a missing hand, as the patient re-experiences the sense of unity with the hand in the brain, the pain of the hand disappears or is relieved. For a patient with a paralyzed hand, since a neural circuit is reconstructed in the brain, the paralysis of the hand is improved. 
     The dynamic image in JP-A-2004-298430 is an image in which a predetermined movement is repeated and which is prepared in advance. In the case of the device of JP-A-2004-298430, editing of a dynamic image is carried out by an editing device so as to suit to the patient, and training is carried out with a training device using the edited dynamic image. Therefore, it takes time and effort to prepare and edit the dynamic image so as to suit the patient. Thus, a display device which enables efficient training to be carried out using a dynamic image (video) suitable for the state of the patient has been desired. 
     SUMMARY 
     The invention has been made in order to solve the foregoing problem and can be realized in the following configurations or application examples. 
     Application Example 1 
     A display device according to this application example includes: a dynamic image data output unit which outputs dynamic image data in which a target object carries out a repetition movement between a first state and a second state; a dynamic image display unit which displays a dynamic image based on the dynamic image data; and a display condition setting unit capable of setting a display condition for the repetition movement. The display condition includes a forward speed which is a speed of shifting from the first state to the second state and a backward speed which is a speed of shifting from the second state to the first state. 
     According to this application example, the display device has the dynamic image data output unit. The dynamic image data output unit outputs dynamic image data to the dynamic image display unit, and the dynamic image display unit displays a dynamic image based on the dynamic image data. In the dynamic image, the repetition movement between the first state and the second state is carried out. The patient views the dynamic image and sees the missing part of the body superimposed on the target object in the dynamic image. Then, the patient thinks in such a way that the missing part of the patient&#39;s own body carries out the repetition movement between the first state and the second state. This action serves as a treatment for reducing the pain of the missing part of the body. 
     In this treatment, when the forward speed and the backward speed are coincident with the patient&#39;s thought, the treatment can efficiently take place. Also, the display device according to this application example has the display condition setting unit, which inputs a forward speed and a backward speed. Also, since the dynamic image data is displayed under a display condition without being edited, the time taken for editing the dynamic image data is not necessary. Thus, a dynamic image in which the forward speed and the backward speed are changed each time to a speed suitable for the state of the patient can be displayed easily and therefore training can be carried out efficiently. 
     Application Example 2 
     In the display device according to the foregoing application example, the dynamic image has a forward shift of shifting from the first state to the second state and a backward shift of shifting from the second state to the first state, a forward waiting state of waiting for a forward waiting time between the backward shift and the forward shift, and a backward waiting state of waiting for a backward waiting time between the forward shift and the backward shift. The display condition includes the forward waiting time and the backward waiting time. 
     According to this application example, the display device waits for the forward waiting time in the forward waiting state between the backward shift and the forward shift. Moreover, the display device waits for the backward waiting time in the backward waiting state between the forward shift and the backward shift. During the forward waiting time, the patient prepares for switching his/her thought from the backward shift to the forward shift. Similarly, during the backward waiting time, the patient prepares for switching his/her thought from the forward shift to the backward shift. Also, since the appropriate forward waiting time and backward waiting time change depending on the physical condition of the patient, it is preferable that an adjustment is made every time training is carried out. Moreover, in the display device according to this application example, the dynamic image can be adjusted, inputting the forward waiting time and the backward waiting time at the display condition setting unit. Therefore, a dynamic image where the forward waiting time and the backward waiting time are changed each time to a time suitable for the state of the patient can be easily displayed and therefore training can be carried out efficiently. 
     Application Example 3 
     In the display device according to the foregoing application example, the dynamic image includes images corresponding to a plurality of states of the target object. The display condition includes an image corresponding to the first state and an image corresponding to the second state. 
     According to this application example, the display condition for the repetition movement includes a screen corresponding to the first state and a screen corresponding to the second state. In the dynamic image, a transition is made across screens of a plurality of states of the target object. Also, since the appropriate screens of the first state and the second state change depending on the physical condition of the patient, it is preferable that an adjustment is made every time training is carried out. Moreover, in the display device according to this application example, the dynamic image can be adjusted, inputting the screens of the first state and the second state at the display condition setting unit. Therefore, a dynamic image where the screens of the first state and the second state are changed each time to a screen of a state suitable for the state of the patient can be easily displayed and therefore training can be carried out efficiently. 
     Application Example 4 
     In the display device according to this application example, the dynamic image display unit is a head-mounted display. 
     According to this application example, the dynamic image display device is a head-mounted display and is used as it is installed on the patient&#39;s head. Therefore, the patient can move the place where the dynamic image is displayed, by moving his/her neck. Therefore, the dynamic image can be aligned with the missing target object according to the posture of the patient. 
     Application Example 5 
     A display method according to this application example includes: displaying dynamic image data in which a repetition movement between a first state and a second state is carried out, according to a display condition for a dynamic image that is set. The display condition includes a forward speed which is a speed of shifting from the first state to the second state and a backward speed which is a speed of shifting from the second state to the first state. 
     According to this application example, the display condition for a dynamic image in which a repetition movement is carried out is inputted to a display condition setting unit. A storage unit stores dynamic image data. The dynamic image data includes data of a dynamic image in which a repetition movement between the first state and the second state is carried out. Then, the dynamic image data is inputted from the storage unit and a dynamic image corresponding to the display condition is displayed. The display condition includes the forward speed which is the speed of shifting from the first state to the second state and the backward speed which is the speed of shifting from the second state to the first state. 
     The patient, viewing the dynamic image, can carry out training so as to consciously move the missing part of the body with the dynamic image. Also, by inputting the forward speed and the backward speed to the display condition setting unit, the dynamic image can be displayed with a forward speed and a backward speed at which the dynamic image can be viewed easily. In this application example, since the dynamic image data is displayed under a display condition without being edited, the time taken for editing the dynamic image data is not necessary. Thus, a dynamic image in which the forward speed and the backward speed are changed each time to a speed suitable for the state of the patient can be displayed easily and therefore training can be carried out efficiently. 
     Application Example 6 
     A program according to this application example causes a computer to function as: a display condition accepting unit which accepts a display condition for a dynamic image; and a dynamic image data output unit which outputs dynamic image data corresponding to the display condition to a display unit. The display condition includes a forward speed which is a speed at which a target object shifts from a first state to a second state and a backward speed which is a speed at which the target object shifts from the second state to the first state. 
     According to this application example, the program causes a computer to function as a display condition accepting unit which accepts a display condition for a dynamic image, and a dynamic image data output unit which outputs dynamic image data corresponding to the display condition to a display unit. The display condition includes the forward speed, which is the speed at which the target object shifts from the first state to the second state, and the backward speed, which is the speed at which the target object shifts from the second state to the first state. 
     The patient views the dynamic image and sees the missing part of the body superimposed on the body in the dynamic image. Then, the patient thinks in such a way that the missing part of the patient&#39;s own body carries out the repetition movement between the first state and the second state. This action serves as a treatment for reducing the pain of the missing part of the body. This treatment can be carried out efficiently when the forward speed and the backward speed are coincident with the patient&#39;s thought. Also, in this application example, the program causes the computer to function as a display condition accepting unit which accepts a display condition for the dynamic image. Therefore, the forward speed and the backward speed can be easily set and displayed each time to a speed suitable for the state of the patient and therefore training can be carried out efficiently. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram showing the configuration of a support device for phantom limb pain treatment according to a first embodiment. 
         FIG. 2  is a schematic view for explaining a display screen. 
         FIG. 3  is a flowchart of a phantom limb pain treatment method. 
         FIGS. 4A-4J  are schematic views for explaining the phantom limb pain treatment method. 
         FIG. 5  is a schematic view for explaining the phantom limb pain treatment method. 
         FIGS. 6A and 6B  are views for explaining the phantom limb pain treatment method. 
         FIGS. 7A and 7B  are views for explaining the phantom limb pain treatment method. 
         FIG. 8  is a schematic view showing the structure of a support device for phantom limb pain treatment according to a second embodiment. 
         FIG. 9  is a schematic view showing the structure of a support device for phantom limb pain treatment according to a third embodiment. 
         FIG. 10  is a schematic view for explaining a phantom limb pain treatment method according to a fourth embodiment. 
         FIGS. 11A and 11B  are schematic views for explaining a phantom limb pain treatment method according to a fifth embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     In the embodiments, characteristic examples of a support device for phantom limb pain treatment and a method for carrying out phantom limb pain treatment using this support device for phantom limb pain treatment will be described with reference to the drawings. Hereinafter, the embodiments will be described with reference to the drawings. Each member in each drawing is illustrated on a different scale from each other in order to achieve a recognizable size in each drawing. 
     First Embodiment 
     A support device for phantom limb pain treatment according to a first embodiment will be described with reference to  FIG. 1  and  FIG. 2 .  FIG. 1  is a block diagram showing the configuration of a support device for phantom limb pain treatment. As shown in  FIG. 1 , a support device for phantom limb pain treatment  1  has a head-mounted display  2  as a dynamic image display unit. The head-mounted display  2  is installed on a head  3   a  of a patient  3  (person). On the head-mounted display  2 , a mirror part  2   a  is installed in positions facing eyes  3   b  of the patient  3 . The head-mounted display  2  has a projection unit  2   b . The projection unit  2   b  emits light to the mirror part  2   a . The light is reflected by the mirror part  2   a  and becomes incident on the eyes  3   b . The patient  3  can view a virtual dynamic image based on the light incident on the eyes  3   b . The head-mounted display  2  can allow the right eye and the left eye to see different dynamic images from each other. Therefore, the head-mounted display  2  can allow the patient  3  to see a stereoscopic image in addition to a planar screen. The mirror part  2   a  is a non-transmitting mirror. 
     The support device for phantom limb pain treatment  1  has a camera  4 . The camera  4  is capable of high-speed shooting and can shoot  300  screens per second. The camera  4  has an objective lens and a CCD (charge coupled device) image pickup element incorporated inside. The camera  4  has an objective lens with a long focusing range. The camera  4  takes in light reflected by an object present in a field of view, through the objective lens, and the light passing through the objective lens forms an image on the CCD image pickup element. Then, the image formed on the CCD image pickup element is converted to an electrical signal, thus enabling image pickup of the object present in the field of view. The camera  4  can use an image pickup tube or a CMOS (complementary metal-oxide semiconductor) image sensor instead of the CCD image pickup element. Moreover, an infrared image sensor may be used as well. 
     The head-mounted display  2  has a communication unit  2   c . The support device for phantom limb pain treatment  1  has a control device  5 , and the communication unit  2   c  communicates with and transmits and receives data to and from the control device  5 . The communication unit  2   c  may employ wireless communication such as communication using radio waves as a medium or communication using light as a medium, or a configuration of wired communication. In this embodiment, for example, the communication unit  2   c  is a device which carries out Bluetooth communication. 
     The patient  3  has hands  3   c  as a part of the body. The patient  3  has one hand  3   c  missing, and the other hand  3   c  is in a healthy condition. The patient  3  carries out training to eliminate an itch or pain felt in the missing hand  3   c , using support device for phantom limb pain treatment  1 . In this embodiment, for example, it is assumed that the left hand of the patient  3  is healthy and the right hand is missing. The camera  4  is used when shooting an image of the left hand. The camera  4  shoots an image of the hand  3   c  and outputs the shot image to an input/output interface  6  of the control device  5 . 
     The control device  5  has the input/output interface  6 . An input/output terminal  7 , a speaker  8 , and a communication device  9  are connected to the input/output interface  6 . The input/output terminal  7  has an input key  7   a , a touch panel  7   b , and a display unit  7   c . The input key  7   a  is a button for the patient  3  to input an instruction content when operating the support device for phantom limb pain treatment  1 . The touch panel  7   b  is a part to operate a point within an image displayed on the head-mounted display  2  and the display unit  7   c . Touching the surface of the touch panel  7   b  with a finger and moving the finger thereon enables the pointer to be moved. Also, tapping the surface of the touch panel  7   b  enables an instruction to be given to select the site where the pointer is located. For the touch panel  7   b , for example, an electrostatic capacitive sensor or pressure sensor can be used. 
     When the patient  3  wears the head-mounted display  2 , it is difficult for the patient  3  to see the input key  7   a . At this time, the patient  3  can feel around to operate the touch panel  7   b  so as to operate the pointer within the screen displayed on the head-mounted display  2  and thus can operate the support device for phantom limb pain treatment  1 . On the display unit  7   c , the same dynamic image or image as the dynamic image or image displayed on the head-mounted display  2  is displayed. An assistant who assists the patient  3  with the training can view the dynamic image on the display unit  7   c  and thus guide the patient  3 . Moreover, the assistant can operate the input key  7   a  and the touch panel  7   b  and thus can operate the support device for phantom limb pain treatment  1 . 
     The speaker  8  has the function of communicating a message to the patient  3  with an audio signal. When the patient  3  is undergoing a rehabilitation treatment, the control device  5  can communicate a message to the patient  3  from the speaker  8  even when the patient  3  is not concentrating his/her attention on the dynamic image projected on the mirror part  2   a.    
     The communication device  9  is a device which communicates with the communication unit  2   c  installed in the head-mounted display  2 . The communication device  9  and the communication unit  2   c  communicate data or the like of a dynamic image projected from the projection unit  2   b.    
     In addition, the control device  5  has a CPU  10  (central processing unit) as a computing unit which carries out various kinds of computation processing as a processor, and a storage section  11  as a storage unit which stores various kinds of information. The input/output interface  6  and the storage section  11  are connected to the CPU  10  via a data bus  12 . 
     The storage section  11  is a concept including a semiconductor memory such as RAM or ROM, a hard disk, or an external storage device such as DVD-ROM. Functionally, a storage area for storing dynamic image data  13  projected by the projection unit  2   b  is set. The dynamic image data  13  also includes data of an image shot by the camera  4 . In addition, a storage area for storing setting data  14  of a playback condition or the like at the time of playing back the dynamic image of the dynamic image data  13  is set. In addition, a storage area for storing a software program  15  describing control procedures for the operation of the support device for phantom limb pain treatment  1  is set. In addition, a storage area which functions as a work area, temporarily file or the like for the CPU  10 , and various other kinds of storage areas are set. 
     The CPU  10  is configured to control the support device for phantom limb pain treatment  1  according to the software program  15  stored in the storage section  11 . The CPU  10  has a display condition input unit  16  which sets a condition for playing back a dynamic image, as a specific functional implementation unit. The display condition input unit  16  displays a screen which prompts an input of a playback condition for a dynamic image, on the head-mounted display  2  and the display unit  7   c . Then, the patient  3  or the assistant operates the input key  7   a  or the touch panel  7   b  to input a display condition for playing back a dynamic image. Then, the display condition input unit  16  stores the playback condition for the dynamic image into the storage section  11  as the setting data  14 . 
     In addition, the CPU  10  has a dynamic image forming unit  17 . The dynamic image forming unit  17  shoots a dynamic image in which the healthy hand  3   c  moves, and stores the dynamic image into the storage section  11  as the dynamic image data  13 . Moreover, the dynamic image forming unit  17  performs editing to add an inverted image of the dynamic image and stores the image into the storage section  11  as the dynamic image data  13 . 
     In addition, the CPU  10  has a dynamic image transmitting unit  18  as a dynamic image data output unit. The dynamic image transmitting unit  18  has the function of transferring the data of the dynamic image data included in the dynamic image data  13  to the head-mounted display  2  and the display unit  7   c . The dynamic image transmitting unit  18  has a memory which stores data corresponding to the display condition for playback, and the head-mounted display  2  has a memory which stores the data of the dynamic image. Then, the dynamic image transmitting unit  18  transfers the data of the dynamic image to the memory of the head-mounted display  2 . In the head-mounted display  2 , the projection unit  2   b  projects the dynamic image, using the dynamic image data transferred to the memory. 
       FIG. 2  is a schematic view for explaining a display screen. A display screen  21  shown in  FIG. 2  is a screen displayed on the head-mounted display  2  and the display unit  7   c . The display screen  21  has an image section  21   a  and a dialog section  21   b . In the image section  21   a , a dynamic image  23  in which an image  22  of a hand as a target object moves is displayed. In this embodiment, an example of training for the patient  3  having the hand  3   c  missing is employed, and in the dynamic image  23 , a dynamic image shifting from the state where the hand  3   c  is open to the state where the hand  3   c  is closed and then shifting from the state where the hand  3   c  is closed to the state where the hand  3   c  is open is shown. 
     The state where the hand  3   c  is open is a first state. The state where the hand  3   c  is closed is a second state. A shift from the first state to the second state is a forward shift. A shift from the second state to the first state is a backward shift. Between the movement of the backward shift and the movement of the forward shift, a time period during which the movement of the image  22  of the hand is stopped is provided. The stopping of the movement of the image  22  of the hand at this time is referred to as forward waiting, and the waiting time is a forward waiting time. Similarly, between the movement of the forward shift and the movement of the backward shift, a time period during which the movement of the image  22  of the hand is stopped is provided. The stopping of the movement of the image  22  of the hand at this time is referred to as backward waiting, and the waiting time is a backward waiting time. Therefore, the movements of the image  22  of the hand in the dynamic image  23  are carried out in order of the forward shift, the backward waiting, the backward shift, and the forward waiting. Then, after the forward waiting, the movements are repeated again from the forward shift. 
     The dialog section  21   b  is a screen where the patient  3  or the assistant inputs and sets a display condition for playing back the dynamic image  23 . A start position input section  24  is arranged at the top in the illustration of the dialog section  21   b . In the start position input section  24 , a frame which is an image used as the first state, of frames which are images included in the dynamic image, can be set. In the start position input section  24 , a guide line  24   a  is arranged extending in the horizontal direction in the illustration, and a position indication mark  24   b  can move along the guide line  24   a . A pointer  25  is displayed in the dialog section  21   b . The pointer  25  is an arrow-shaped mark. The patient  3  and the assistant can move the pointer  25  by touching the touch panel  7   b  with a finger and moving the finger thereon. 
     The patient  3  and the assistant move the pointer  25  and superimpose the pointer  25  on the position indication mark  24   b . Then, as the patient  3  and the assistant tap the touch panel  7   b  with a finger, an input to the start position input section  24  is enabled. Then, the position indication mark  24   b  can be moved to the left and right, linked with the movement of the pointer  25 . When the pointer  25  moves to the left and right, the image displayed in the image section  21   a  is switched, corresponding to the position of the position indication mark  24   b.    
     When the position indication mark  24   b  is moved to the left end of the guide line  24   a , the first image of the dynamic image that is shot is displayed in the image section  21   a . When the position indication mark  24   b  is moved to the right end of the guide line  24   a , the last image of the dynamic image that is shot is displayed in the image section  21   a . Then, when the patient  3  and the assistant move the position of the position indication mark  24   b , the image displayed in the image section  21   a  is switched. The patient  3  and the assistant view the screen displayed in the image section  21   a  and select the first state. After selecting the first state, the patient  3  and the assistant taps the touch panel  7   b  with a finger. Thus, the position indication mark  24   b  stops moving and the image of the first state is decided. 
     A start position space  24   c  is arranged on the right-hand side of the guide line  24   a  in the illustration. In the start position space  24   c , the frame number of the screen indicated by the position indication mark  24   b  is displayed. When the position indication mark  24   b  is located at the left end of the guide line  24   a , the numeral  1  is displayed in the start position space  24   c . When the position indication mark  24   b  is located at the right end of the guide line  24   a , a numeral corresponding to the last frame number of the dynamic image that is shot is displayed in the start position space  24   c . Then, when the position indication mark  24   b  is moved, a number corresponding to the position of the position indication mark  24   b  is displayed in the start position space  24   c.    
     An end position input section  26  is arranged below the start position input section  24  in the illustration. In the end position input section  26 , a frame which is an image used as the second state, of frames which are images included in the dynamic image, can be set. In the end position input section  26 , a guide line  26   a  is arranged extending in the horizontal direction in the illustration, and a position indication mark  26   b  can move along the guide line  26   a . The patient  3  and the assistant can move the position indication mark  26   b , using the pointer  25 . 
     Similarly to the operation of the start position input section  24 , when the patient  3  and the assistant move the position of the position indication mark  26   b , the image displayed in the image section  21   a  is switched. The patient  3  and the assistant views the screen displayed in the image section  21   a  and selects a frame to be used as the second state. After selecting the second state, the patient  3  and the assistant taps the touch panel  7   b  with a finger. Thus, the position indication mark  26   b  stops moving and the second state is decided. An end position space  26   c  is arranged on the right-hand side of the guide line  26   a  in the illustration. In the end position space  26   c , the frame number of the screen indicated by the position indication mark  26   b  is displayed. Then, when the position indication mark  26   b  is moved, a number corresponding to the position of the position indication mark  26   b  is displayed in the end position space  26   c.    
     A forward speed input section  27  as a display condition setting unit is arranged below the end position input section  26  in the illustration. In the forward speed input section  27 , the playback speed of the dynamic image  23  in the forward shift can be set. In the forward speed input section  27 , a guide line  27   a  is arranged extending in the horizontal direction in the illustration, and a speed indication mark  27   b  can move along the guide line  27   a . The patient  3  and the assistant can move the speed indication mark  27   b , using the pointer  25 . 
     A forward speed space  27   c  is arranged on the right-hand side of the guide line  27   a  in the illustration. In the forward speed space  27   c , the playback speed of the dynamic image  23  indicated by the speed indication mark  27   b  is displayed. Then, when the speed indication mark  27   b  is moved, a speed corresponding to the position of the speed indication mark  27   b  is displayed in the forward speed space  27   c . The unit for the playback speed of the dynamic image  23  is fps (frames per second). In this embodiment, for example, the recording speed of the dynamic image  23  shot by the camera  4  is 300 fps. Then, the playback speed that can be designated in the forward speed input section  27  is 1 to 300 fps. When the playback speed is 10 fps, it means that the dynamic image is played back at a speed one-tenth of the recording speed. Therefore, the support device for phantom limb pain treatment  1  can play back the movement of the hand  3   c  at a low speed in the forward shift. After selecting the playback speed in the forward shift, the patient  3  and the assistant tap the touch panel  7   b  with a finger. Thus, the speed indication mark  27   b  stops moving and the playback speed in the forward shift is decided. 
     A backward speed input section  28  as a display condition setting unit is arranged below the forward speed input section  27  in the illustration. In the backward speed input section  28 , the playback speed of the dynamic image  23  in the backward shift can be set. In the backward speed input section  28 , a guide line  28   a  is arranged extending in the horizontal direction in the illustration, and a speed indication mark  28   b  can move along the guide line  28   a . The patient  3  and the assistant can move the speed indication mark  28   b , using the pointer  25 . 
     A backward speed space  28   c  is arranged on the right-hand side of the guide line  28   a  in the illustration. In the backward speed space  28   c , the playback speed of the dynamic image  23  indicated by the speed indication mark  28   b  is displayed. Then, when the speed indication mark  28   b  is moved, a speed corresponding to the position of the speed indication mark  28   b  is displayed in the backward speed space  28   c . The playback speed that can be designated in the backward speed input section  28  is 1 to 300 fps. Therefore, the support device for phantom limb pain treatment  1  can play back the movement of the hand  3   c  at a low speed in the backward shift. After selecting the playback speed in the backward shift, the patient  3  and the assistant tap the touch panel  7   b  with a finger. Thus, the speed indication mark  28   b  stops moving and the playback speed in the backward shift is decided. 
     A forward waiting time input section  29  is arranged below the backward speed input section  28  in the illustration. In the forward waiting time input section  29 , the time of forward waiting can be set. In the forward waiting time input section  29 , a guide line  29   a  is arranged extending in the horizontal direction in the illustration, and a time indication mark  29   b  can move along the guide line  29   a . The patient  3  and the assistant can move the time indication mark  29   b , using the pointer  25 . 
     A forward waiting time space  29   c  is arranged on the right-hand side of the guide line  29   a  in the illustration. In the forward waiting time space  29   c , the time indicated by the time indication mark  29   b  is displayed. Then, when the time indication mark  29   b  is moved, a time corresponding to the position of the time indication mark  29   b  is displayed. Also, the time that can be designated in the forward waiting time input section  29  is 0.1 to 10 seconds. Therefore, the support device for phantom limb pain treatment  1  can prepare sufficiently during a preparation time for changing the movement of the hand  3   c  from the backward shift to the forward shift. After selecting the forward waiting time, the patient  3  and the assistant tap the touch panel  7   b  with a finger. Thus, the time indication mark  29   b  stops moving and the time of forward waiting is decided. 
     A backward waiting time input section  30  is arranged below the forward waiting time input section  29  in the illustration. In the backward waiting time input section  30 , the time of backward waiting can be set. In the backward waiting time input section  30 , a guide line  30   a  is arranged extending in the horizontal direction in the illustration, and a time indication mark  30   b  can move along the guide line  30   a . The patient  3  and the assistant can move the time indication mark  30   b , using the pointer  25 . 
     A backward waiting time space  30   c  is arranged on the right-hand side of the guide line  30   a  in the illustration. In the backward waiting time space  30   c , the time indicated by the time indication mark  30   b  is displayed. Then, when the time indication mark  30   b  is moved, a time corresponding to the position of the time indication mark  30   b  is displayed. Also, the time that can be designated in the backward waiting time input section  30  is 0.1 to 10 seconds. Therefore, the support device for phantom limb pain treatment  1  can prepare sufficiently during a preparation time for changing the movement of the hand  3   c  from the forward shift to the backward shift. After selecting the backward waiting time, the patient  3  and the assistant tap the touch panel  7   b  with a finger. Thus, the time indication mark  30   b  stops moving and the time of backward waiting is decided. 
     An end mark  31  and a hide-dialog mark  32  are arranged below the backward waiting time input section  30  in the illustration. When the patient  3  and the assistant place the pointer  25  on the end mark  31  and tap the touch panel  7   b  with a finger, the operation of the support device for phantom limb pain treatment  1  can be stopped. When the patient  3  and the assistant place the pointer on the hide-dialog mark  32  and tap the touch panel  7   b  with a finger, the display of the dialog section  21   b  can be stopped and the area of the image section  21   a  can be increased. The startup of the support device for phantom limb pain treatment  1  and the redisplay of the dialog section  21   b  can be carried out by operating the input key  7   a.    
     Next, a phantom limb pain treatment method using the support device for phantom limb pain treatment  1  described above will be described with reference to  FIGS. 3 to 7 .  FIG. 3  is a flowchart of the phantom limb pain treatment method.  FIGS. 4 to 7  are views for explaining the phantom limb pain treatment method. In the flowchart of  FIG. 3 , Step S 1  is equivalent to a shooting process. It is the process of shooting the healthy hand  3   c  of the patient  3  with its shape changed from an open state to a closed state. Next, the processing shifts to Step S 2 . Step S 2  is a dynamic image forming process. This process is the process of editing a shot dynamic image  23  and forming a dynamic image  23  for training. Next, the processing shifts to Step S 3  and Step S 4 . Step S 3  and Step S 4  are carried out in parallel. 
     Step S 3  is a training process. This process is the process in which the patient  3  views the dynamic image and thinks to move the missing hand  3   c . Step S 4  is a condition adjustment process. This process is the process of changing the range of repeatedly playing back the dynamic image  23 , the playback speed, the forward waiting time, and the backward waiting time. When Step S 3  ends, the phantom limb pain treatment ends. 
     Next, the phantom limb pain treatment method will be described in detail, using  FIGS. 4 to 7  and corresponding to the steps shown in  FIG. 3 .  FIG. 4  is a view corresponding to the shooting process of Step S 1 . As shown in  FIG. 4 , the hand  3   c  of the patient  3  is shot, with its shape gradually changed from an open state to a closed state. In this embodiment, since the patient  3  has his/her right hand missing, the left hand is shot. A shot image of the hand  3   c  shown in  FIG. 4( a )  is a first image. A shot image of the hand  3   c  shown in  FIG. 4( b )  is a second image. Similarly, a shot image of the hand  3   c  shown in  FIG. 4( c )  is a third image. A shot image of the hand  3   c  shown in  FIG. 4( d )  is a fourth image. A shot image of the hand  3   c  shown in  FIG. 4( e )  is a fifth image. A shot image of the hand  3   c  shown in  FIG. 4( f )  is a sixth image. A shot image of the hand  3   c  shown in  FIG. 4( g )  is a seventh image. A shot image of the hand  3   c  shown in  FIG. 4( h )  is an eighth image. A shot image of the hand  3   c  shown in  FIG. 4( i )  is a ninth image. A shot image of the hand  3   c  shown in  FIG. 4( j )  is a tenth image. 
     The first to tenth images are sequential images. Also, each image is shot at the shooting speed of 300 fps and therefore shot at a higher speed than with an ordinary camera. Therefore, if the playback speed is reduced to below 300 fps, the images can be played back at a lower speed than the speed at which the images are shot. 
       FIG. 5  is a view corresponding to the dynamic image forming process of Step S 2 . As shown in  FIG. 5 , in Step S 2 , an image  22   b  of the right hand, which is a duplicate of an image  22   a  of the left hand inverted in the left-right direction, is formed. Then, the image  22   a  of the left hand and the image  22   b  of the right hand are juxtaposed to the left and right. Then, based on these images, a sequential forward dynamic image  23   a  continuing from the first image to the tenth image is formed. The forward dynamic image  23   a  is a dynamic image  23  changing from the image  22  of the hand in which the hand  3   c  is open to the image  22  of the hand in which the hand  3   c  is closed. Moreover, a backward dynamic image  23   b , which is the forward dynamic image  23   a  played back in reverse, is formed. The backward dynamic image  23   b  is a dynamic image  23  changing from the image  22  of the hand in which the hand  3   c  is closed to the image  22  of the hand in which the hand  3   c  is open. 
       FIG. 6  and  FIG. 7  are views corresponding to the training process of Step S 3  and the condition adjustment process of Step S 4 .  FIG. 6( a )  to  FIG. 7( b )  are time charts showing the progress of the dynamic image  23 . The vertical axis represents screen numbers projected in the dynamic image  23 . The horizontal axis represents the transition of time. Time shifts from the left-hand side to the right-hand side in the illustrations. In Step  3 , the support device for phantom limb pain treatment  1  plays back the dynamic image  23 . Then, the patient  3  views the dynamic image  23  and thinks to open and close the hand  3   c  synchronously with the image  22  of the hand. The patient  3  has the right hand  3   c  missing and therefore cannot physically open and close the right hand  3   c  but imagines and thinks to open and close the hand  3   c  in the brain. It is preferable that the left hand  3   c  is opened and closed with the dynamic image  23 . Thus, the patient tends to have a sensation of the right hand  3   c  opening and closing synchronously. 
     A first transition line  33  in  FIG. 6( a )  indicates the progress of the dynamic image  23 . As indicated by the first transition line  33 , the forward dynamic image  23   a  from the first image to the tenth image is played back first. At this time, the patient  3  thinks to turn the hand  3   c  from the open state to the closed state while viewing the dynamic image  23 . After the support device for phantom limb pain treatment  1  plays back the forward dynamic image  23   a , backward waiting  34  as a backward waiting state is carried out. In the backward waiting  34 , the dynamic image  23  stops for a backward waiting time  34   a . During this time, the patient  3  prepares for the backward shift. After the backward waiting  34 , the support device for phantom limb pain treatment  1  plays back the backward dynamic image  23   b  from the tenth image to the first image. At this time, the patient  3  thinks to turn the hand  3   c  from the closed state to the open state. Then, after the support device for phantom limb pain treatment  1  plays back the backward dynamic image  23   b , forward waiting  35  as a forward waiting state is carried out. In the forward waiting  35 , the dynamic image  23  stops for a forward waiting time  35   a . During this time, the patient  3  prepares for the forward shift. Repeating the above contents, the training is carried out. 
     The state of the hand  3   c  shown on the screen at the time of starting the forward dynamic image  23   a  is a first state  36 . Then, the state of the hand  3   c  shown on the screen at the time of ending the forward dynamic image  23   a  is a second state  37 . In Step S 3 , the patient  3  carries out a repetition movement of moving the hand  3   c  between the first state  36  and the second state  37 . Then, on the first transition line  33 , the first state  36  is the state shown by the first image, and the second state  37  is the image shown by the tenth image. 
     First, the patient  3  places the hand  3   c  in the first state  36 . The first state  36  is the state where the patient  3  has the hand  3   c  open. Next, the patient  3  turns the hand  3   c  into the second state  37  while viewing the forward dynamic image  23   a . That is, the patient  3  turns the hand  3   c  from the open state to the closed state. Next, the patient  3  carries out the backward waiting  34  during the backward waiting time  34   a . During this time, the patient  3  maintains the hand  3   c  in the closed state. Then, the patient  3  prepares to open the hand  3   c.    
     In the backward waiting  34 , the hand  3   c  is in the second state  37 . The second state  37  is the state where the patient  3  has the hand  3   c  closed. Next, the patient  3  turns the hand  3   c  into the first state  36  while viewing the backward dynamic image  23   b . That is, the patient  3  turns the hand  3   c  from the closed state to the open state. Next, the patient  3  carries out the forward waiting  35  during the forward waiting time  35   a . During this time, the patient  3  maintains the hand  3   c  in the open state. Then, the patient  3  prepares to close the hand  3   c . As indicated by the first transition line  33 , subsequently the training while viewing the forward dynamic image  23   a  and the training while viewing the backward dynamic image  23   b  are carried out repeatedly. 
     The support device for phantom limb pain treatment  1  can carry out the condition adjustment process of Step S 4 , interrupting the training process of Step S 3 . Next, an example in which the first state  36  and the second state  37  of the dynamic image  23  are changed will be described. The patient  3  or the assistant moves the position indication mark  24   b  indicating the start position, from the position indicating the first image to a position indicating an image between the third image and the fourth image. Moreover, the patient  3  or the assistant moves the position indication mark  26   b  indicating the end position, from the position indicating the tenth image to a position indicating an image between the eighth image and the ninth image. Then, the training process of Step S 3  is resumed. In Step S 3 , the dynamic image transmitting unit  18  outputs the dynamic image data in which the first state  36  and the second state  37  are changed, to the head-mounted display  2 . Then, the head-mounted display  2  displays the dynamic image  23  in which the first state  36  and the second state  37  are changed. The dynamic image transmitting unit  18  only changes the playback condition and causes the dynamic image data  13  to be played back without making any change thereto. 
     A second transition line  38  in  FIG. 6( b )  indicates the progress of the dynamic image  23 . As indicated by the second transition line  38 , the forward dynamic image  23   a  is started from the image between the third image and the fourth image and is played back up to the image between the eighth image and the ninth image. At this time, the patient  3  thinks to turn the hand  3   c  from a slightly open state to a slightly closed state. After the playback of the forward dynamic image  23   a , the backward waiting  34  is carried out and then the backward dynamic image  23   b  is played back. The backward dynamic image  23   b  is started from the image between the eighth image and the ninth image and is played back up to the image between the third image and the fourth image. At this time, the patient  3  thinks to turn the hand  3   c  from the slightly closed state to the slightly open state. After the playback of the backward dynamic image  23   b , the forward waiting  35  is carried out and then the forward dynamic image  23   a  is played back. Repeating the above contents, the training is carried out. 
     When the patient is not accustomed to the training of thinking of the opening/closing of the hand  3   c  in the first state  36 , thinking may be easier if the opening/closing of the hand  3   c  is narrower. In this case, the training is carried out, adjusting the first state  36  and the second state  37  and thus setting the dynamic image  23  showing a state which is easier for the patient  3  to think of. Meanwhile, when the patient has become accustomed to the training, the training is carried out, adjusting the first state  36  and the second state  37  and thus setting the dynamic image  23  showing a state which is more difficult for the patient  3  to think of. Thus, the training can be carried out efficiently. 
     Next, an example in which the forward speed, which is the speed of playing back the forward dynamic image  23   a  of the dynamic image  23 , and the backward speed, which is the speed of playing back the backward dynamic image  23   b , are changed will be described. The patient  3  or the assistant moves the speed indication mark  27   b  in the forward speed input section  27  indicating the forward speed. The speed indication mark  27   b  is moved to reduce the numeral in the forward speed space  27   c . Moreover, the patient  3  or the assistant moves the speed indication mark  28   b  in the backward speed input section  28  indicating the backward speed. The speed indication mark  28   b  is moved to reduce the numeral in the backward speed space  28   c . Then, the training process of Step S 3  is resumed. In Step S 3 , the dynamic image transmitting unit  18  outputs the dynamic image data in which the forward speed and the backward speed are changed, to the head-mounted display  2 . Then, the head-mounted display  2  displays the dynamic image  23  in which the forward speed and the backward speed are changed. The dynamic image transmitting unit  18  only changes the playback condition and causes the dynamic image data  13  to be played back without making any change thereto. 
     A third transition line  41  in  FIG. 7( a )  indicates the progress of the dynamic image  23 . As indicated by the third transition line  41 , the playback time of the forward dynamic image  23   a  is longer than the playback time of the forward dynamic image  23   a  indicated by the second transition line  38 . Therefore, on the third transition line  41 , the forward speed is slower. Similarly, as indicated by the third transition line  41 , the playback time of the backward dynamic image  23   b  is longer than the playback time of the backward dynamic image  23   b  indicated by the second transition line  38 . Therefore, on the third transition line  41 , the backward speed is slower. 
     When the patient is not accustomed to the training of thinking of the opening/closing of the hand  3   c , thinking may be difficult if the speed of opening and closing the hand  3   c  is fast. In this case, the training is carried out, slowing down the forward speed and the backward speed and thus setting the dynamic image  23  of a state which is easier for the patient  3  to think of. Meanwhile, when the patient has become accustomed to the training, the training is carried out, increasing the forward speed and the backward speed and thus setting the dynamic image  23  of a state which is more difficult for the patient  3  to think of. Thus, the training can be carried out efficiently. 
     Next, an example in which the forward waiting time  35   a  and the backward waiting time  34   a  of the dynamic image  23  are changed will be described. The patient  3  or the assistant moves the time indication mark  29   b  in the forward waiting time input section  29  indicating the forward waiting time  35   a . The time indication mark  29   b  is moved to increase the numeral in the forward waiting time space  29   c . Moreover, the patient  3  or the assistant moves the time indication mark  30   b  in the backward waiting time input section  30  indicating the backward waiting time  34   a . The time indication mark  30   b  is moved to increase the numeral in the backward waiting time space  30   c . Then, the training process of Step S 3  is resumed. In Step S 3 , the dynamic image transmitting unit  18  outputs the dynamic image data in which the forward waiting time  35   a  and the backward waiting time  34   a  are changed, to the head-mounted display  2 . Then, the head-mounted display  2  displays the dynamic image  23  in which the forward waiting time  35   a  and the backward waiting time  34   a  are changed. The dynamic image transmitting unit  18  only changes the playback condition and causes the dynamic image data  13  to be played back without making any change thereto. 
     A fourth transition line  42  in  FIG. 7( b )  indicates the progress of the dynamic image  23 . As indicated by the fourth transition line  42 , the backward waiting time  34   a  is longer than the backward waiting time  34   a  indicated by the third transition line  41 . Therefore, on the fourth transition line  42 , the time until the backward dynamic image  23   b  is started after the forward dynamic image  23   a  ends is longer. Similarly, as indicated by the fourth transition line  42 , the forward waiting time  35   a  is longer than the forward waiting time  35   a  indicated by the third transition line  41 . Therefore, on the fourth transition line  42 , the time until the forward dynamic image  23   a  is started after the backward dynamic image  23   b  ends is longer. 
     When the patient is not accustomed to the training of thinking of the opening/closing of the hand  3   c , thinking may be difficult if the forward waiting time  35   a  and the backward waiting time  34   a  are short. In this case, the forward waiting time  35   a  and the backward waiting time  34   a  are made longer. Then, the training is carried out, setting the state where it is easier for the patient  3  to prepare to think, during the forward waiting time. Meanwhile, when the patient has become accustomed to the training, the training is carried out, reducing the forward waiting time  35   a  and the backward waiting time  34   a  and thus setting the dynamic image  23  of a state which is more difficult for the patient  3  to think of. Thus, the training can be carried out efficiently. 
     As described above, this embodiment has the following effects. 
     (1) According to this embodiment, the dynamic image transmitting unit  18  outputs dynamic image data to the head-mounted display  2 , and the head-mounted display  2  displays the dynamic image  23  based on the dynamic image data. In the dynamic image  23 , the image of the hand  3   c  in the first state  36  to the image of the hand  3   c  in the second state  37  are repeatedly shown. The patient  3  views the dynamic image  23  and sees the hand  3   c  superimposed on the image  22  of the hand in the dynamic image  23 . Then the patient  3  thinks to carry out a repetition movement between the first state  36  and the second state  37 . By this training, the pain in the missing hand  3   c  can be relieved. 
     (2) According to this embodiment, when the forward speed and the backward speed in the training are coincident with the speeds which the patient thinks of, the treatment can be carried out efficiently. Also, the support device for phantom limb pain treatment  1  has the forward speed input section  27  which input the forward speed and the backward speed input section  28  which inputs the backward speed. Since the dynamic image data  13  is displayed under a display condition without being edited, the time taken for editing the dynamic image data  13  is not necessary. Therefore, the dynamic image in which the forward speed and the backward speed are changed each time to a speed suitable for the state of the patient can be displayed and therefore the training can be carried out efficiently. 
     (3) According to this embodiment, the support device for phantom limb pain treatment  1  waits for the forward waiting time  35   a  in the forward waiting  35 . Moreover, the support device for phantom limb pain treatment  1  waits for the backward waiting time  34   a  in the backward waiting  34 . During the forward waiting time  35   a , the patient  3  prepares to switch his/her thought from the backward shift to the forward shift. Similarly, during the backward waiting time  34   a , the patient  3  prepares to switch his/her thought from the forward shift to the backward shift. Then, since the forward waiting time  35   a  and the backward waiting time  34   a  change depending on the physical condition of the patient  3 , it is preferable that an adjustment is made every time training is carried out. Also, the support device for phantom limb pain treatment  1  in this embodiment can input the forward waiting time  35   a  and the backward waiting time  34   a  via the display condition input unit  16  and thus adjust the dynamic image. Therefore, the dynamic image in which the forward waiting time  35   a  and the backward waiting time  34   a  are changed each time to a speed suitable for the state of the patient  3  can be displayed and therefore training can be carried out efficiently. 
     (4) According to this embodiment, the display condition for the repetition movement includes an image corresponding to the first state  36  and an image corresponding to the second state  37 , of the dynamic image  23 . In the dynamic image  23 , a transition is made across images of a plurality of states. Also, since the appropriate first state  36  and second state  37  change depending on the physical condition of the patient  3 , it is preferable that an adjustment is made every time training is carried out. Moreover, the support device for phantom limb pain treatment  1  can input the first state  36  and the second state  37  via the display condition setting unit  16 . Therefore, the screens of the first state  36  and the second state  37  can be changed each time to the dynamic image  23  suitable for the state of the patient  3  and thus displayed and therefore the training can be carried out efficiently. 
     (5) According to this embodiment, the site where the dynamic image  23  is displayed is the head-mounted display  2 , which is used as it is installed on the head  3   a  of the patient  3 . Therefore, the patient  3  can move the place where the dynamic image  23  is displayed, by moving his/her neck. Therefore, the dynamic image  23  can be aligned with the missing part of the body according to the posture of the patient  3 . 
     Second Embodiment 
     Next, an embodiment of the support device for phantom limb pain treatment will be described, using the schematic plan view of  FIG. 8  showing a structure of the support device for phantom limb pain treatment. The difference of this embodiment from the first embodiment is that the dynamic image  23  is displayed on a display panel. The explanation of the same features as in the first embodiment is omitted. 
     That is, in this embodiment, a support device for phantom limb pain treatment  45  has a display device  46 , as shown in  FIG. 8 . The display device  46  is a flat panel display or a display with a curved surface. As the display device  46 , a liquid crystal display or an OLED (organic light-emitting diodes) display can be used. A communication unit  46   c  is installed in the display device  46 . The communication unit  46   c  can receive data of the dynamic image  23  from the communication device  9 . 
     The display device  46  is arranged between the head  3   a  and the hand  3   c  of the patient  3 . Then, the patient  3  can carry out the training of thinking to open and close the missing hand  3   c  while viewing the dynamic image  23  displayed on the display device  46 . In this case, too, the patient  3  or the assistant can see the dynamic image  23 , inputting a display condition for the dynamic image  23  with the use of the input/output terminal  7  and thus easily changing the playback condition each time. 
     Third Embodiment 
     Next, an embodiment of the support device for phantom limb pain treatment will be described, using the schematic plan view of  FIG. 9  showing a structure of the support device for phantom limb pain treatment. The difference of this embodiment from the first embodiment is that the dynamic image  23  is displayed on a screen, using a projector. The explanation of the same features as in the first embodiment is omitted. 
     That is, in this embodiment, a support device for phantom limb pain treatment  49  has a projector  50  and a screen  51 , as shown in  FIG. 9 . A communication unit  50   c  is installed in the projector  50 . The communication unit  50   c  can receive data of the dynamic image  23  from the communication device  9 . 
     The screen  51  is installed in front of the patient  3 . Then, the patient  3  can carry out the training of thinking to open and close the missing hand  3   c  while viewing the dynamic image  23  displayed on the screen  51 . In this case, too, the patient  3  or the assistant can see the dynamic image  23 , inputting a display condition for the dynamic image  23  with the use of the input/output terminal  7  and thus easily changing the playback condition each time. 
     Fourth Embodiment 
     Next, an embodiment of the support device for phantom limb pain treatment will be described, using the schematic view of  FIG. 10  for explaining a phantom limb pain treatment method. The difference of this embodiment from the first embodiment is that the dynamic image data  13  is not of a shot image of the hand  3   c  of the patient  3  but is the dynamic image data  13  of a shot image of a hand  3   c  of another person. 
     That is, in this embodiment, the dynamic image  23  is displayed in the image section  21   a , as shown in  FIG. 10 . In this dynamic image  23 , the image  22  of a hand of an able-bodied person is shown. In the shooting process of Step S 1 , shooting is carried out in the state where the able-bodied person is opening and closing the hand  3   c . Then, in the training process of Step S 3 , the patient  3  carries out training, observing the dynamic image  23  in which the able-bodied person is opening and closing the hand  3   c . Therefore, even when the patient  3  has both the left and right hands  3   c  missing, the patient  3  can carry out the training using the support device for phantom limb pain treatment  1 . Then, in this case, too, the assistant can input a display condition for the dynamic image  23 , using the input/output terminal  7 , and the patient  3  can view the dynamic image  23 , changing the playback condition each time. 
     Fifth Embodiment 
     Next, an embodiment of the support device for phantom limb pain treatment will be described, using the schematic view of  FIG. 11  for explaining a phantom limb pain treatment method. The difference of this embodiment from the first embodiment is that the dynamic image data  13  is not a shot image of the hand  3   c  but is the dynamic image data  13  of a shot image of a foot. 
     That is, in this embodiment, the dynamic image  23  is displayed in the image section  21   a , as shown in  FIG. 11 . In this dynamic image  23 , an image  54  of a foot is shown. On the screen of the dynamic image  23  in  FIG. 11( a ) , the state where a person is sitting on a chair, with his/her knees bent and his/her feet dropped, is shown. On the screen of the dynamic image  23  in  FIG. 11( b ) , the state where a person is sitting on a chair, with his/her knees extended and his/her feet lifted up, is shown. 
     In the shooting process of Step S 1 , a movement in which the patient  3  sitting on a chair moves his/her foot up and down is shot. In the dynamic image forming process of Step S 2 , a dynamic image of a left-right symmetric mirror image is formed. Then, in the training process of Step S 3 , the patient  3  carries out training, observing the dynamic image  23  in which the feet are moved up and down. Therefore, even when the patient  3  has one foot missing, the patient  3  can carry out the training using the support device for phantom limb pain treatment  1 . Then, in this case, too, the patient  3  or the assistant can input a display condition for the dynamic image  23 , using the input/output terminal  7 , and the patient  3  can view the dynamic image  23 , easily changing the playback condition each time. 
     This embodiment is not limited to the foregoing embodiments. A person with ordinary knowledge in the field can add various changes and improvements within the technical scope of the invention. Modifications will be described below. 
     Modification 1 
     In the first embodiment, the dynamic image  23  in which the images  22  of the left and right hands make the same movement is used. The right hand and the left hand may make different movements from each other. A dynamic image  23  in which the images  22  of the left and right hands alternately open and close may be used. A dynamic image  23  with which the patient  3  can easily carry out training can be used. 
     Modification 2 
     In the first embodiment, one can input the display condition for the dynamic image  23  while viewing the screen displayed in the dialog section  21   b . An operation part such as a rotating dial or a sliding knob may be attached to the input/output terminal  7  so as to enable input of the display condition. One can operate the operation part based on the sensation of touching the operation part without seeing it. 
     Modification 3 
     In the first embodiment, a planar image is displayed on the head-mounted display  2 . A stereoscopic image may be displayed on the head-mounted display  2 . It facilitates the patient  3  to perceive the sensation of actually moving the hand  3   c.    
     Modification 4 
     In the first embodiment, the control device  5  is not connected to an external device. The control device  5  may be connected to a server via the communication device  9  and a network. Then, a plurality of setting data  14  when the patient  3  drives the support device for phantom limb pain treatment  1  is stored in the server. Also, when the patient  3  carries out training, the setting data  14  may be transferred from the server. When a plurality of support device for phantom limb pain treatments  1  is installed, the previous setting data  14  may be utilized even if different devices are used. 
     Modification 5 
     In the first embodiment, a pain relief treatment for the hand  3   c  is carried out using the support device for phantom limb pain treatment  1 . A pain relief treatment or rehabilitation of fingers may also be carried out using the support device for phantom limb pain treatment  1 . By using the dynamic image  23  in which fingers move, a treatment similar to the first embodiment can be carried out. In this case, too, the patient  3  or the assistant can input a display condition for the dynamic image  23 , using the input/output terminal, and the patient  3  can view the dynamic image  23 , changing the playback condition each time. In addition, this can be used in various cases such as for elbows and ankles. 
     Modification 6 
     In the first embodiment, the mirror part  2   a  is a non-transmitting mirror. The mirror part  2   a  may also be a transmitting type. In this case, the dynamic image forming unit  17  forms a dynamic image in such a way that the hand  3   c  seen through the mirror part  2   a  and the image  22  of the hand in the dynamic image are superimposed on each other. Thus, the patient  3  can have the sensation of the paralyzed hand  3   c  moving. Moreover, a cover may be attached to the mirror part  2   a  so as to switch between the transmitting type and the non-transmitting type. A type which enables the patient to have the sensation of the hand  3   c  moving more easily is selected. 
     Modification 7 
     In the first embodiment, the support device for phantom limb pain treatment  1  is used for the pain relief treatment in which the patient tries to move the missing hand  3   c . In addition, this may also be used for rehabilitation of a body part that has become hard to move due to nerve or brain damage. Viewing the dynamic image, the patient can train the nervous system by moving the body part that has become hard to move. 
     In the first embodiment, the dynamic image  23  in which the image  22  of the hand as a target object moves is displayed. However, the dynamic image to be displayed is not limited to this. It may be another part of the body, and not only the actual body shot in an image but also a simulated body based on an animation or the like may be displayed. Also, as an object to be displayed, not only those belonging to the body but also a totally different object may be displayed. The totally different object is not particularly limited but may be, for example, a book or a door. That is, it may be anything that the patient can visually recognize or understand as making a movement similar to a repetition movement of the body. 
     The entire disclosure of Japanese Patent Application No. 2015-033743 filed Feb. 24, 2015 is expressly incorporated by reference herein.