To permit guide cordage such as a rope or a wire to be very simply and effectively stretched in accordance with a variety of sports even in a multipurpose stadium where many sports are played.

The line installation support system is composed of wireless IC tags 2 embedded at mark positions including corners and intersections and having identification information for every supposed field line of sports, markers 3 provided so as to make the embedment positions of the wireless IC tags 2 visibly from a ground surface, a reader 5 reading the identification information of the wireless IC tags 2, a portable computer 4 connected to the reader 5 and storing information of correspondences between the embedment positions of the wireless IC tags 2 having the identification information and the mark positions of field lines of sports and capable of displaying the position information of the wireless IC tags 2 read through the reader 5 on a monitor in relation to the supposed field lines of sports or display equipment having storage and computation functions.