To control a plurality of toll station numbers with a simple process using a single exchange by suppressing the increase in a memory quantity.
A common number part (04) in toll station numbers (045, 044) in a plurality of area TCA1, TCA2 whose toll station numbers differ is used for an internal toll station number, numbers resulting from adding non-common number parts (5, 4) to each head of local station numbers (111-113, 221-223) are used for internal local station numbers(5111-5113, 4221-4223), a telephone number translation table is formed according to a telephone number configuration consisting of the internal toll station number and the internal local station numbers and an exchange EX makes exchange service control by using the translation table.
KOBAYASHI TOSHIAKI
HONMA MASAYUKI
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