A phone book group management method includes: providing a display field for entering a contact name and a group name of a phone book; receiving a contact name and at least one group name consecutively in the display field; analyzing the received contact name and at least one group name; and registering contact information in a group according to the analyzed contact name and at least one group name. A new group may be created while registering a contact name in a phone book or while editing phone book data of a registered contact. Accordingly, the procedure for registering a contact may be simplified, and management of user groups may be executed more easily and efficiently.