Methods and apparatus are provided that provides an external storage space of an application executed in the terminal. Registration information of a user is received through the application via an application registration request of the user. A registration request message is transmitted to a server preset for the application. The registration request message requests allocation of a storage space for the user in the server according to the registration information. The storage space corresponds to the application. A registration completion message is received from the server. The user is informed of completion of an application registration through the application, when the registration completion message is received from the server.