A server apparatus of an album site has a data storage area DB, and manages data in relation to the name of a management unit which is a unit for collectively managing the data. A client apparatus manages a data group which contains at least one image file in the client apparatus in relation to a data group name corresponding to the data group, and uploads the data group and data group name to the server apparatus. The server apparatus determines whether a management unit name corresponding to the data group name uploaded from the client apparatus exists in the data storage area. If it is determined that no corresponding data group name exists, a new management unit name corresponding to the data group name is automatically defined, and the data group is stored in relation to the management unit name.