and deleting a line are repeatedly carried out according to the prior art technique by comparing fig1 invention with fig1 prior art technique in both fig1 and 1 identical processings for the add or delete of connection indicated from the top to the bottom in the left side column are carried out the comparison shows that in the scheduling system according to the invention the number of objects to be location moved is significantly reduced as compared with that in the prior art technique for example in newly receiving a line in the prior art technique a part of other connections having a pcr value equal to the contemplated connection and all of connections having a smaller pcr value than the contemplated connection should be moved whereas in the scheduling system according to the invention there is no need to move the connections on the other hand in deleting a line in the prior art a part of other connections having a pcr value equal to the contemplated connection and all of connections having a smaller pcr value than the contemplated connection should be moved whereas in the scheduling system according to the invention what is required is only to move one connection having a pcr value equal to or larger than the contemplated connection further also in the unused free area within the cell read sequence management table the invention has no disadvantage over the prior art technique this is apparent from fig1 example of invention and fig1 example of prior art which each show a table illustrating conversion to the number of lines having pcr values obtained by raising 2 to the nth power wherein n is an integer in the unused area within the cell read sequence management table the comparison of.