To recognize the visitor and according to situation will be able to manage in order is connected with a cellular phone the phone

PURPOSE: An interphone connected to a portable terminal is provided to execute an immediate action according to a situation by obtaining the purpose of a visitor. CONSTITUTION: An internal interphone(40) is connected to an internet communication network(100) and a telephone base station(102). The internal interphone is connected to a house owner phone(50) in order to provide a voice and an image call. A house owner confirms a visiting purpose and an ID(Identity) of a visitor(A) in a remote site. When a person who is one family member pushes an external call button(11), the house owner pushes predetermined door opening numbers in order to allow the person to enter into a house. [Reference numerals] (10) External interphone; (100) Internet communication network; (102) Telephone base station; (11) External call button; (112) Police station; (119) Fire station; (12) Detection sensor; (13) Camera; (14) External monitor screen; (15) External microphone; (16) External speaker; (21) Handset; (22) Telephone number button; (23) Call signal sound speaker; (24) Confirmation button; (25) Internal monitor screen; (26) Security office calling button; (27) Power display lamp; (28) Emergency lamp; (29) Absent button; (30) Occupied button; (31) Security button; (32) Internal microphone; (33) Recording device; (34) Warning broadcasting device; (35) Gas/fire detecting device; (36) Timer; (37) Mode setting button; (38) Regeneration button; (39) Alerting mode; (50) House owner phone; (A) Visitor; (D) Central processing device