A mobile terminal comprising: a display; a wireless internet module configured for wireless internet access; and a controller configured to: acquire and integrally manage information about a plurality of voice over internet protocol, VoIP, services, that can communicate through the wireless internet module by logging in the plurality of VoIP services a terminal's user joins, distinguish information about a first user group corresponding to the acquired plurality of VoIP services from information about a second user group not corresponding to the acquired plurality of VoIP service and display the information in the display, cause the display to display a first graphic user interface for performing a message transmission function depending on a selection of a specific user, control to display in substantial real time whether communication with the specific user is charged by: displaying a first icon for indicating a default message application when a message to be transmitted to the specific user is not free of charge; or displaying second icon for indicating a VoIP service respectively, set the VoIP service as a communication means with respect to the specific user when the message is to be transmitted to the specific user free of charge by the VoIP service and transmit the message to the specific user by the VoIP service. a display; a wireless internet module configured for wireless internet access; and a controller configured to: acquire and integrally manage information about a plurality of voice over internet protocol, VoIP, services, that can communicate through the wireless internet module by logging in the plurality of VoIP services a terminal's user joins, distinguish information about a first user group corresponding to the acquired plurality of VoIP services from information about a second user group not corresponding to the acquired plurality of VoIP service and display the information in the display, cause the display to display a first graphic user interface for performing a message transmission function depending on a selection of a specific user, control to display in substantial real time whether communication with the specific user is charged by: displaying a first icon for indicating a default message application when a message to be transmitted to the specific user is not free of charge; or displaying second icon for indicating a VoIP service respectively, set the VoIP service as a communication means with respect to the specific user when the message is to be transmitted to the specific user free of charge by the VoIP service and transmit the message to the specific user by the VoIP service. acquire and integrally manage information about a plurality of voice over internet protocol, VoIP, services, that can communicate through the wireless internet module by logging in the plurality of VoIP services a terminal's user joins, distinguish information about a first user group corresponding to the acquired plurality of VoIP services from information about a second user group not corresponding to the acquired plurality of VoIP service and display the information in the display, cause the display to display a first graphic user interface for performing a message transmission function depending on a selection of a specific user, control to display in substantial real time whether communication with the specific user is charged by: displaying a first icon for indicating a default message application when a message to be transmitted to the specific user is not free of charge; or displaying second icon for indicating a VoIP service respectively, set the VoIP service as a communication means with respect to the specific user when the message is to be transmitted to the specific user free of charge by the VoIP service and transmit the message to the specific user by the VoIP service. displaying a first icon for indicating a default message application when a message to be transmitted to the specific user is not free of charge; or displaying second icon for indicating a VoIP service respectively, set the VoIP service as a communication means with respect to the specific user when the message is to be transmitted to the specific user free of charge by the VoIP service and transmit the message to the specific user by the VoIP service.