Data management device in a karaoke communications system

A data management device for managing data supplied from a data distributor via both a data communication path and a storage medium, comprising:

• a receiving means for receiving first data file transmitted from the data distributor by the data communication path;
• a rewritable memory for storing the first data file received by said receiving means;
• a reading means for accommodating a storage medium on which second data files are recorded and for reading out the second data files from the storage medium distributed by the data distributor;
• a file number comparing means for comparing a file number of the first data file with a file number of the second data file when new first data file is transmitted or when a new storage medium is set to the reading means, said file number identifying contents of the data file;
• a version comparing means for comparing a version of the first data file with a version of the second data file if said file number comparing means detects that the file numbers of the first and the second data files are identical to each other;
• and
• a file managing means for invaliding or erasing the first data file if the version of the first data file is older than that of the second data file.

A data management device for managing data supplied from a data distributor via both a data communication path and a storage medium, comprising:

• a receiving means for receiving data file corresponding to a plurality of items transmitted from a data distributor by the data communication path;
• a rewritable memory for storing the data file received by said receiving means;
• a reading means for accommodating a storage medium on which the data files are recorded and for reading out the data files from the storage medium distributed by the data distributor;
• a detecting means for detecting the data files, corresponding to the same item, recorded on both of the rewritable memory and the storage medium when new first data file is transmitted or when a new storage medium is set to the reading means;
• and
• a file managing means for invalidating or erasing the data files in the rewritable memory when said detecting means detects the data files corresponding to the same item in both of the rewritable memory and the storage medium.

A data management method for managing data supplied from a data distributor via both a data communication path and a storage medium, comprising the steps of:

• receiving first data file transmitted from the data distributor via the data communication path;
• storing the received first data file into a rewritable memory;
• reading out the second data files from the storage medium distributed by the data distributor by a reading unit which accommodates the storage medium on which second data files are recorded;
• comparing a file number of the first data file with a file number of the second data file when new first data file is transmitted or when a new storage medium is set to the reading unit, said file number identifying contents of the data file;
• and
• invalidating or erasing the first data file corresponding to the file number if the file number of the first data file is coincident with the file number of the second data file.

A data management method for managing data supplied from a data distributor via both a data communication path and a storage medium, comprising the steps of:

• receiving first data file transmitted from the data distributor by the data communication path;
• storing the received first data file into a rewritable memory;
• reading out the second data files from the storage medium distributed by the data distributor by a reading unit which accommodates the storage medium on which second data files are recorded;
• comparing a file number of the first data file with a file number of the second data file when new first data file is transmitted or when a new storage medium is set to the reading unit, said file number identifying contents of the data file;
• comparing a version of the first data file with a version of the second data file if it is detected that the file numbers of the first and the second data files are identical to each other;
• and
• invalidating or erasing the first data file if the version of the first data file is older than that of the second data file.

A data management method for managing data supplied from a data distributor via both a data communication path and a storage medium, comprising the steps of:

• receiving data file corresponding to a plurality of items transmitted from a data distributor by the data communication path;
• storing the received data file into a rewritable memory;
• reading out the second data files from the storage medium distributed by the data distributor by a reading unit which accommodates the storage medium on which second data files are recorded;
• detecting the data files, corresponding to the same item, recorded on both of the rewritable memory and the storage medium when new first data file is transmitted or when a new storage medium is set to the reading unit;
• and
• invalidating or erasing the data files in the rewritable memory when the data files corresponding to the same item are detected in both of the rewritable memory and the storage medium.