A file management system that transmits a record file of voice data or image data created by a local device to a center device over a network and manages the record file in the center device. The center device receives attribute information about the record file, including the ID of the record file, which is created in the local device, further acquires extended attribute information associated with the attribute information from a PBX, call control server, or customer server, stores management table including the attribute information and the extended attribute information. The extended attribute information of the record file suggests frequency of the reference for the record file in the local device. The center device decides the timing of the upload request for the record file based on the extended attribute information of the record file.