A method for an associated phone calling is disclosed, that a mobile terminal needs to have association relationships with one or multiple communication terminals in a network. First, having received a call initiating by a mobile terminal which has an association relationship, said network determining a communication terminal as an associated terminal according to said association relationship; then said network initiating calls to a called terminal and said associated terminal, respectively; then having received answer messages from said called terminal and said associated terminal, said network establishing connection between said associated terminal and said called terminal. The invention also provides a communication system that implements said method, at least comprises a call processing equipment and a service control equipment. Applying the invention, a subscriber can initiate a call from a personal phone book in his mobile terminal and then communicates with called party with other terminal.