mr oo to mr xx u201d the part u201c mr oo u201d is intended party 39 s information of the origination source which is a name or a phone number stored in the intended party 39 s information storage unit 17 on the other hand the part u201c mr xx u201d is user information of the destination which is a name or a phone number stored in the user information storage unit 16 next in the shared cellular phone 4 when the user performs the off hook operation by means of the operation unit 19 the control unit 11 notifies the base station 3 of the off hook operation from the public radio communication unit 13 and talking on the phone is started t 64 and the sequence is ended fig7 shows a sequence diagram indicative of one example of the operation of origination from the shared cellular phone 4 according to the present invention when one of the users using the shared cellular phone 4 performs the operation of origination by means of the operation unit 19 this sequence is started in the shared cellular phone 4 the control unit 11 takes in a list of user information from the user information storage unit 16 and makes the display unit 18 display the list of user information and the user selects user information by means of the operation unit 19 in case a plurality of users are registered to determine a phone number of thus selected user information as a phone number of the origination source t 71 in case one item of user information is registered in the user information storage unit 16 the control unit 11 determines.