PURPOSE: To utilize effectively a radio wave of the mobile communications system by enabling the arrival of a call only to a subscriber registered and in use when plural subscribers uses in common mobile communications terminal equipment, thereby to avoiding a futile calling.

CONSTITUTION: When a call comes to a mobile communications terminal equipment 1, a call control section 7 references a subscriber data storage section 4 and makes a request to a caller subscriber to enter a user number when the common subscriber connection service and the user number are registered. When the caller subscriber dials the user number in addition, the call control section 7 collates the additional dial number with the registration number of the storage section 4 and makes call control of a communications terminal equipment 1 when they are coincident. The control section 7 informs that the subscriber of the user number is not using the communications terminal equipment 1 at present when they are dissident. Thus, a futile call control is avoided and the utilizing efficiency of the mobile communications system is improved.