A maintenance support system includes a terminal including an imaging device, a device configured to identify a three-dimensional area TA including a maintenance target T with reference to a predetermined reference point, a device for identifying a position (vector A) of the imaging device in an initial state with respect to the reference point, a device for identifying a change of position (vector B) from the initial state of the imaging device, a device for identifying a position (vector C) of the reference point with reference to the imaging device in a post-movement state in which the terminal has moved, and identifying a pixel area corresponding to the three-dimensional area in a captured image, and a device for generating a processed image in which a portion other than the pixel area is made invisible. A communication device is provided for transmitting the processed image to a support terminal.