An information processing apparatus communicates with a plurality of terminals having same user identification information and communicates with a server for performing a data synchronization among the plurality of terminals on the basis of the user identification information. The information processing apparatus comprises: a unit for managing the user identification information and terminal identification information of the plurality of terminals in association with each other; a unit for forming new user identification information different from the user identification information for a designated terminal among the plurality of terminals; a unit for registering the formed new user identification information into the server; and a unit for transmitting the formed new user identification information to the designated terminal.