Patent Publication Number: US-2006002245-A1

Title: Content storage apparatus and method, and content storage system

Description:
CROSS REFERENCE TO RELATED APPLICATIONS  
      The present invention contains subject matter related to Japanese Patent Application JP2004-193889 filed in the Japanese Patent Office on Jun. 30, 2004, the entire contents of which being incorporated herein by reference.  
     BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      This invention relates to a content storage apparatus and method, and content storage system, and more particularly, is suitably applied to a portable reproduction apparatus for storing music data transferred from an external apparatus such as a personal computer in a local hard disk drive and reproducing desired music data from the hard disk drive in response to user operation.  
      2. Description of the Related Art  
      Portable reproduction apparatus for storing music data transferred from a personal computer in a local hard disk drive and reproducing desired music data from the hard disk drive in response to user operation have become increasingly popular in recent years.  
      Such portable reproduction apparatus are generally designed to display the titles and other pieces of information of a plurality of music data stored in the local hard disk drive on a display section, by genre or numbers of times of reproduction and to reproduce selected music data in response to user operation (see, U.S. Patent Application Publication No. 2004/0055446A1).  
     SUMMARY OF THE INVENTION  
      A technique to display the titles of the music data by number of times of reproduction will be now described. A portable reproduction apparatus has a database storing the number of times by which each music data has been reproduced as shown in  FIG. 12 . Note that such a “number of times of reproduction database” is prepared by using a predetermined format and  FIG. 12  is a simplified illustration of the database.  
      The data numbers assigned to the respective music data stored in the hard disk drive of the portable reproduction apparatus are classified into categories of numbers of times of reproduction and registered in the number of times of reproduction database. With this arrangement, the portable reproduction apparatus can recognize the number of times of reproduction of each of the music data stored in the local hard disk drive on the basis of the number of times of reproduction database and hence it can classify the titles of the music data into categories of numbers of times and display the classified tittles.  
      When the portable reproduction apparatus is connected to a personal computer typically by way of a cable for the purpose of transferring music data from the personal computer to the portable reproduction apparatus, the personal computer operates as master for actively executing the process of transferring the music data, whereas the portable reproduction apparatus operates as slave relative to the personal computer.  
      More specifically, the personal computer executes a process of accessing the hard disk drive of the portable reproduction apparatus that is operating as slave by way of a cable and writing the music data to the hard disk drive in the process of transferring music data to the portable reproduction apparatus.  
      At this time, the personal computer has to register the data number of each of the newly written music data to the number of times of reproduction database so as to classify it into the number of times of reproduction [0] category GP 1 . However, since the number of times of reproduction database is a database that is not owned by the personal computer but built in the portable reproduction apparatus, the personal computer does not recognize the rule of registration that “the data number of a newly written music data is to be registered to the number of times of reproduction database so as to classify it into the number of times of reproduction [0] category GP 1 ”. Therefore, there arises a problem that the personal computer may not correctly register the data number of the newly written music data to the number of times of reproduction database and consequently the portable reproduction apparatus may not correctly manage the number of times of reproduction of the music data.  
      On the other hand, the portable reproduction apparatus stores in advance a program for executing a process for the number of times of reproduction database among other programs and hence it recognizes the rule of registration that “the data number of a newly written music data is to be registered to the number of times of reproduction database so as to classify it into the number of times of reproduction [0] category GP 1 ”. However, as long as the personal computer is transferring music data to the portable reproduction apparatus, the latter is operating as slave relative to the former because they are connected to each other by way of a cable. Therefore, as long as the personal computer is transferring music data to the portable reproduction apparatus, the latter may not actively execute the process of registering the data number of the music data to the number of times of reproduction database.  
      It may be conceivable to have the portable reproduction apparatus register the data number of each of the newly written music data to the number of times of reproduction database when the portable reproduction apparatus is separated from the personal computer and becomes to be able to actively execute processes. However, as long as the personal computer is transferring music data to the portable reproduction apparatus, the latter is operating as slave relative to the former and hence may not grasp the music data newly written to it by the former. Therefore, when the portable reproduction apparatus is separated from the personal computer, it may not identify the newly written music data among the music data stored in its own hard disk drive. Thus, there arises a problem that the portable reproduction apparatus may not correctly register the data number of the newly written music data to the number of times of reproduction database and consequently it may not correctly manage the number of times of reproduction of the music data.  
      In view of the foregoing, the present invention intends to provide a content storage apparatus and method, and content storage system to realize improved content data management.  
      According to one embodiment of the present invention, there is provided a content transfer system including a content transfer apparatus for transferring content data to a content storage apparatus and the content storage apparatus for storing the content data, the content storage apparatus having a management database for storing content identification information for identifying the content data and corresponding data numbers. The content transfer apparatus has a storage unit for storing desired content data; a transfer unit for transferring the desired content data to the content storage apparatus; and a control unit for detecting an unused data number in the content storage apparatus and transferring the desired content data to the content storage apparatus together with the unused data number.  
      Further, according to one embodiment of the present invention, there is provided a content transfer method in a content transfer system including a content transfer apparatus for transferring content data to a content storage apparatus and the content storage apparatus for storing the content data, the content storage apparatus having a management database for storing content identification information for identifying the content data and corresponding data numbers. This content transfer method includes: a detection step of detecting an unused data number in the content storage apparatus; and a transfer step of transferring desired content data to the content storage apparatus together with the unused data number.  
      Still further, according to one embodiment of the present invention, there is provided a content transfer apparatus for transferring content data to a content storage apparatus for storing the content data, the content storage apparatus having a management database for storing content identification information for identifying the content data and corresponding data numbers. The content transfer apparatus includes: a storage unit for storing desired content data; a transfer unit for transferring the desired content data to the content storage apparatus; and a control unit for detecting an unused data number in the content storage apparatus and transferring the desired content data to the content storage apparatus together with the unused data number.  
      According to the present invention, the content transfer apparatus of the content transfer system is provided with the control unit for detecting an unused data number in the content storage apparatus and transferring the desired content data to the content storage apparatus together with the unused data number, resulting in realizing improved content data management.  
      The nature, principle and utility of the invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings in which like parts are designated by like reference numerals or characters. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      In the accompanying drawings:  
       FIG. 1  is a schematic illustration of a music data transfer system of the first and second embodiment;  
       FIG. 2  is a schematic block diagram of a personal computer;  
       FIG. 3  is a schematic block diagram of a portable reproduction apparatus;  
       FIG. 4  is a schematic illustration explaining a database;  
       FIG. 5  is a flow chart of a writing process (1);  
       FIG. 6  is a schematic illustration (1) of data stored in the hard disk drive of a portable reproduction apparatus;  
       FIG. 7  is a flow chart of a deleting process (1);  
       FIG. 8  is a schematic illustration (2) of data stored in the hard disk drive of a portable reproduction apparatus;  
       FIG. 9  is a flow chart of a writing process (2);  
       FIG. 10  is a schematic illustration (3) of data stored in the hard disk drive of a portable reproduction apparatus;  
       FIG. 11  is a flow chart of a deleting process (2); and  
       FIG. 12  is a schematic illustration (4) of data stored in the hard disk drive of a portable reproduction apparatus. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Now, preferred embodiments of the present invention will be described with reference to the accompanying drawings.  
     (1) First Embodiment  
      Referring to  FIG. 1 , reference numeral  1  generally denotes a music data transfer system that has a personal computer  4  for transferring the music data downloaded typically by way of Internet NT to a portable reproduction apparatus  3  by way of a cable  2  and the portable reproduction apparatus  3  adapted to store the music data transferred to it from the personal computer  4  by way of the cable  2  in a local hard disk drive.  
      Now, referring to  FIG. 2 , the configuration of the personal computer  4  will be described below. The central processing unit (CPU)  10  of the personal computer  4  that comprehensively controls the personal computer  4  is connected to a read only memory (ROM)  12 , a random access memory (RAM)  13 , a hard disk drive  14  and an input/output interface section  15  by way of a bus  11 . The input/output interface section  15  is by turn connected to a connecting section  16  for connecting the personal computer  4  to the portable reproduction apparatus  3  by way of the cable (e.g., a USB cable)  2 , a display section  17  for displaying various pieces of information, an operation section  18  that typically includes a keyboard, a communication section  19  for communicating with an external server by way of Internet NT and a drive section  20  for reading data recorded on a compact disc (CD) or the like.  
      The CPU  10  of the personal computer  4  reads various programs stored in the ROM  12  and the hard disk drive  14  and unfolds them in the RAM  13  so as to execute various processes including those for downloading music data and transferring them.  
      More specifically, as the user operates the operation section  18  for downloading music data, the CPU  10  of the personal computer  4  accesses an external server by way of Internet NT by controlling the communication section  19  and acquires the music data corresponding to the downloading operation of the user from the server. Then, the CPU  10  of the personal computer  4  stores the music data it has acquired in the hard disk drive  14 .  
      Thereafter, if the user operates the operation section  18  for transferring the music data to the portable reproduction apparatus  3 , the CPU  10  of the personal computer  4  reads out the music data corresponding to the transferring operation of the user from the hard disk drive  14  and writes the music data it has read out into the hard disk drive of the portable reproduction apparatus  3  that is connected to it and operating as slave by way of the cable  2 .  
      Now, the configuration of the portable reproduction apparatus  3  will be described by referring to  FIG. 3 . The CPU  30  of the portable reproduction apparatus  3  that comprehensively controls the portable reproduction apparatus  3  is connected to a ROM  32 , a RAM  33 , a connecting section  34  for connecting the portable reproduction apparatus  3  to the personal computer  4  by way of the cable  2 , a hard disk drive  35  storing music data and various databases, which will be described in greater detail hereinafter, an operation section  36  that typically has operation keys and operation buttons, a display section  37  that typically has a liquid crystal display and a sound emitting section  38  that corresponds to an ear phone or a loudspeaker.  
      The CPU  30  of the portable reproduction apparatus  3  reads out various programs stored in the ROM  32  and the hard disk drive  35  and unfolds them in the RAM  33  so as to execute various processes including those for reproducing music data.  
      Thereafter, if the user operates the operation section  36  for reproducing music data, the CPU  30  of the portable reproduction apparatus  3  reads out the music data from the hard disk drive  35  and executes a predetermined reproduction process on the read out music data so as to output music from the sound emitting section  38 .  
      The hard disk drive  35  of the portable reproduction apparatus  3  includes a music management database. The music management database stores the titles of the music data that are currently stored in the hard disk drive  35  of the portable reproduction apparatus  3  and the corresponding data numbers assigned to the respective music data.  
      Additionally, the hard disk drive  35  of the portable reproduction apparatus  3  also includes a number of times of reproduction database, a reproduction time zone database and a new music database.  
      The number of times of reproduction database stores the number of times of reproduction of each music data stored in the hard disk drive  35  of the portable reproduction apparatus  3 . The reproduction time zone database stores the time zones when each music data is reproduced. The new music database is used to grasp the music data that are newly written to the hard disk drive  35  of the portable reproduction apparatus  3  by the personal computer  4 . These databases are prepared by using a predetermined format.  
      The CPU  30  of the portable reproduction apparatus  3  displays various images on the display section  37  on the basis of the data stored in the databases. More specifically, the CPU  30  of the portable reproduction apparatus  3  recognizes the number of times of reproduction of each music data stored in the hard disk drive  35  based on the number of times of reproduction database and displays an image SC 1  showing the titles of the music data that are reproduced frequently on the display section  37  according to the outcome of the recognition. Additionally, the CPU  30  of the portable reproduction apparatus  3  recognizes the reproduction time zones of each music data stored in the hard disk drive  35  based on the reproduction time zone database and displays an image SC 2  showing the titles of music data that are reproduced frequently in a predetermined time zone (“morning” in  FIG. 4 ) on the display section  37  according to the outcome of the recognition. Furthermore, the CPU  30  of the portable reproduction apparatus  3  recognizes the titles of the music data that are newly written by the personal computer  4  in the last 24 hours and displays an image SC 3  showing the outcome of the recognition on the display section  37 .  
      Now, the write process sequence RT 1  to be followed when writing a new music data to the hard disk drive  35  of the portable reproduction apparatus  3  will be described below in detail by referring to  FIGS. 5 and 6 .  
      When the user operates the operation section  18  of the personal computer  4  to transfer music data “tune Z” to the portable reproduction apparatus  3 , the CPU  10  of the personal computer  4  proceeds to Step SP 1  in response to the operation and recognizes unused data number “0026” that is not assigned to any of the music data currently stored in the hard disk drive  35  of the portable reproduction apparatus  3 , referring to the music management database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 2 , where it annexes the recognized data number “0026” to the music data “tune Z” to be transferred to the portable reproduction apparatus  3  and subsequently writes the music data “tune Z”, to which the data number “0026” has been annexed, to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2  ( FIG. 6 ). In this way, the music data “tune Z”, to which the data number “0026” that is unique in the portable reproduction apparatus  3  is annexed is transferred from the personal computer  4  to the portable reproduction apparatus  3 .  
      Thereafter, the CPU  10  of the personal computer  4  proceeds to Step SP 3 , where it registers the data number “0026” of the newly written music data to the music management database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 4 , where it writes data on the result of the write process that indicates the data number “0026” of the newly written music data to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      As a result, when the portable reproduction apparatus  3  is separated from the personal computer  4  and becomes to be able to actively execute processes, it can recognize the data number “0026” of the music data that is newly written to the hard disk drive  35  according to the data on the outcome of the write process stored in the hard disk drive  35 . Thus, the portable reproduction apparatus  3  can register the data number “0026” of the newly written music data so as to make it belong to the number of times of reproduction [0] category GP 1 .  
      Now, the delete process sequence RT 2  to be followed when deleting music data from the hard disk drive  35  of the portable reproduction apparatus  3  will be described below in detail by referring to  FIGS. 7 and 6 .  
      When the user operates the operation section  18  of the personal computer  4  to delete music data “tune F” stored in the hard disk drive  35  of the portable reproduction apparatus  3 , the CPU  10  of the personal computer  4  proceeds to Step SP 11  in response to the operation and recognizes the data number “0006” of the music data that corresponds to the input title “tune F”, referring to the music management database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 12 , where it accesses the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 , identifies the music data of the data number “0006” that is recognized in Step SP 11  among the plurality of music data stored in the hard disk drive  35  and deletes the identified music data.  
      Thereafter, the CPU  10  of the personal computer  4  proceeds to Step SP 13 , where it deletes the registration of the data number “0006” of the deleted music data from the music management database in the hard disk drive  35  of the portable reproduction apparatus  3 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step S 14 , where it writes data on the result of the delete process that indicates the data number “0006” of the deleted music data to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      As a result, when the portable reproduction apparatus  3  is separated from the personal computer  4  and becomes to be able to actively execute processes, it can recognize the data number “0006” of the music data that is deleted from the hard disk drive  35  according to the data on the outcome of the delete process stored in the hard disk drive  35 . Thus, the portable reproduction apparatus  3  can delete the registration of the data number “0006” of the deleted music data from the number of times of reproduction database.  
      With the above described arrangement, when the user operates the operation section  18  of the personal computer  4  to transfer music data to the portable reproduction apparatus  3 , the CPU  10  of the personal computer  4  annexes a data number that is unique in the portable reproduction apparatus  3  to the music data to be transferred and subsequently writes the music data, to which the data number has been annexed, to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 . At this time, the CPU  10  of the personal computer  4  generates data on the result of the write process that indicates the data number of the written music data and writes the generated data on the result of the write process to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      As a result, when the portable reproduction apparatus  3  is separated from the personal computer  4  and becomes to be able to actively execute processes, it can recognize the data number of the music data that is newly written to the hard disk drive  35  according to the data on the outcome of the write process stored in the hard disk drive  35 . Thus, the portable reproduction apparatus  3  can register the data number of the newly written music data in the number of times of reproduction database so as to make it belong to the number of times of reproduction [0] category.  
      When, on the other hand, the user operates the operation section  18  of the personal computer  4  to delete music data stored in the hard disk drive  35  of the portable reproduction apparatus  3 , the personal computer  4  accesses the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2  and deletes the music data that corresponds to the delete operation from the hard disk drive  35 . Then, the CPU  10  of the personal computer  4  generates data on the result of the delete process that indicates the data number of the deleted music data and writes the generated data on the result of the delete process to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      As a result, when the portable reproduction apparatus  3  is separated from the personal computer  4  and becomes to be able to actively execute processes, it can recognize the data number of the music data that is deleted from the hard disk drive  35  according to the data on the outcome of the delete process stored in the hard disk drive  35 . Thus, the portable reproduction apparatus  3  can delete the registration of the data number of the deleted music data from the number of times of reproduction database.  
      Thus, with the above described arrangement, after executing a write process of writing music data to or a delete process of deleting music data from the hard disk drive  35  of the portable reproduction apparatus  3  while the personal computer  4  is connected to the portable reproduction apparatus  3 , the personal computer  4  writes the data on the result of the write process that indicates the data number of the music data written by the write process or the data on the result of the delete process that indicates the data number of the music data deleted by the delete process, whichever appropriate, to the hard disk drive  35  of the portable reproduction apparatus  3 . Therefore, when the portable reproduction apparatus  3  is separated from the personal computer  4  and becomes to be able to actively execute processes, it can recognize the data number of the music data written by the personal computer  4  or the data number of the music data deleted by the personal computer  4  on the basis of the data on the result of the write process or the data on the result of the delete process, whichever appropriate, stored in the hard disk drive  35 .  
      As a result, the portable reproduction apparatus  3  can, for example, register the data number of the newly written music data in the number of times of reproduction database so as to make it belong to the number of times of reproduction [0] category and hence, according to the invention, it is possible to realize a portable reproduction apparatus  3  that can correctly manage music data.  
      While the write process sequence RT 1  and the delete process sequence RT 2  of the first embodiment are described by way of an example of registering the data number of music data in and deleting the registration of the data number of music data from the number of times of reproduction database, process sequences similar to RT 1 , RT 2  can be applied to the process of registering the data number of music data to and the process of deleting the data number of music data from the reproduction time zone database and the new music database.  
     (2) Second Embodiment  
      The configuration of the second embodiment of the present invention differs form that of the above described first embodiment in that registration rule information is indicated to the number of times of reproduction database in the hard disk drive  35  of the portable reproduction apparatus  3  as shown in  FIG. 8 . Now, the second embodiment will be described mainly from the viewpoint of the difference.  
      In the second embodiment, information indicating the number of times of reproduction [0] category GP 1  (“class 1”) is described in the number of times of reproduction database as registration rule information INF 1 . The registration rule INF 1  refers to that “the data number of the music data newly written to the hard disk drive  35  of the portable reproduction apparatus  3  is registered in the number of times of reproduction database so as to make it belong to the number of times of reproduction [0] category GP 1 ”.  
      Now, the write process sequence RT 3  to be followed by the second embodiment when writing new music data will be described below in detail by referring to  FIGS. 9 and 10 .  
      When the user operates the operation section  18  of the personal computer  4  to transfer music data “tune Z” to the portable reproduction apparatus  3 , the CPU  10  of the personal computer  4  proceeds to Step SP 21  in response to the operation and recognizes unused data number “0026” that is not assigned to any of the music data currently stored in the hard disk drive  35  of the portable reproduction apparatus  3 , referring to the music management database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 22 , where it annexes the recognized data number “0026” to the music data “tune Z” to be transferred to the portable reproduction apparatus  3  and subsequently writes the music data “tune Z”, to which the data number “0026” has been annexed, to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2  ( FIG. 10 ). In this way, the music data “tune Z”, to which the data number “0026” that is unique in the portable reproduction apparatus  3  is annexed, is transferred from the personal computer  4  to the portable reproduction apparatus  3 .  
      Thereafter, the CPU  10  of the personal computer  4  proceeds to Step SP 23 , where it registers the data number “0026” of the newly written music data to the music management database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 24 , where it recognizes the registration rule that “the data number of the music data newly written to the hard disk drive  35  of the portable reproduction apparatus  3  is registered in the number of times of reproduction database so as to make it belong to the number of times of reproduction [0] category GP 1 ”, referring to the registration rule information INF 1  indicated in a predetermined part of the number of times of reproduction database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 . As a result, the CPU  10  of the personal computer  4  can register the data number “0026” of the music data according to the recognized registration rule in the number of times of reproduction database so as to make it belong to the number of times of reproduction [0] category GP 1 .  
      Now, the delete process sequence RT 4  to be followed by the second embodiment when deleting a music data from the hard disk drive  35  will be described below in detail by referring to  FIGS. 11 and 10 .  
      When the user operates the operation section  18  of the personal computer  4  to delete music data “tune F” stored in the hard disk drive  35  of the portable reproduction apparatus  3 , the CPU  10  of the personal computer  4  proceeds to Step SP 41  in response to the operation and recognizes the data number “0006” of the music data that corresponds to the input title “tune F”, referring to the music management database in the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 42 , where it accesses the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 , identifies the music data of the data number “0006” that is recognized in Step SP 41  among the plurality of music data stored in the hard disk drive  35  and deletes the identified music data.  
      Thereafter, the CPU  10  of the personal computer  4  proceeds to Step SP 43 , where it deletes the registration of the data number “0006” of the deleted music data from the music management database in the hard disk drive  35  of the portable reproduction apparatus  3 .  
      Then, the CPU  10  of the personal computer  4  proceeds to Step SP 44 , where it deletes the registration of the data number “0006” of the deleted music data from the number of times of reproduction database in the hard disk drive  35  of the portable reproduction apparatus  3 . Note that the CPU  10  of the personal computer  4  identifies the data number “0006” in the number of times of reproduction database, referring to all the data numbers indicated in the number of times of reproduction database and erases the identified data number “0006”.  
      With the above described arrangement, the portable reproduction apparatus  3  refers to the registration rule information INF 1  describing the registration rule to be observed when the data number of music data is registered in the number of times of reproduction database and stores it in the number of times of reproduction database.  
      Thus, when the personal computer  4  writes music data to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 , it can recognize the registration rule to be observed when registering the data number of the written music data to the number of times of reproduction database, referring to the registration rule information INF 1  described in a predetermined part of the number of times of reproduction database in the hard disk drive  35 . As a result, the personal computer  4  can correctly register the data number of the written music data in the number of times of reproduction database in the portable reproduction apparatus  3 .  
      With the above described arrangement, when the personal computer  4  writes music data to the hard disk drive  35  of the portable reproduction apparatus  3  by way of the cable  2 , it can recognize the registration rule to be observed when registering the data number of the written music data to the number of times of reproduction database, referring to the registration rule information INF 1  described in a predetermined part of the number of times of reproduction database in the hard disk drive  35 .  
      As a result, the personal computer  4  can correctly register the data number of the written music data in the number of times of reproduction database in the portable reproduction apparatus  3  while it is connected to the portable reproduction apparatus  3  by way of the cable  2 .  
      Unlike the first embodiment, not the portable reproduction apparatus  3  but the personal computer  4  of the second embodiment registers the data number of music data in the number of times of reproduction database. As a result, it is possible to reduce the processing load of the portable reproduction apparatus  3 . Particularly, since the portable reproduction apparatus  3  is carried by the user for use, it is driven to operate by a battery or the like contained in it. Therefore, as the processing load of the portable reproduction apparatus  3  is reduced in this way, the power consumption of the portable reproduction apparatus  3  is also reduced to provide an advantage that the portable reproduction apparatus  3  can be driven to operate for a prolonged period of time.  
      While the write process sequence RT 3  and the delete process sequence RT 4  of the second embodiment are described by way of an example of registering the data number of music data in and deleting the registration of the data number of music data from the number of times of reproduction database, process sequences similar to RT 3 , RT 4  can be applied to the process of registering the data number of music data to and the process of deleting the data number of music data from the reproduction time zone database and the new music database. If such is the case, the registration rule information on registration of the data number of music data written to the hard disk drive  35  of the portable reproduction apparatus  3  is shown in advance to a predetermined part of the reproduction time zone database and the new music database. Then, these database can provide advantages similar to those described above by referring to the number of times of reproduction database.  
     (3) Other Embodiments  
      While the above embodiments are described in terms of storing music data in the portable reproduction apparatus  3 , the present invention is by no means limited thereto and can be applied to any arrangement involving the use of video data, computer programs or various content data.  
      While the above embodiments are described in terms of a content storage apparatus for storing content data (music data) to which a portable reproduction apparatus  3  is applicable, a portable reproduction apparatus  3  is also applicable to various information processing apparatus including Personal Digital Assistances (PDAs), portable telephone sets and the like.  
      While the above embodiments are described in terms of a personal computer  4  that executes processes (for writing content data and erasing content data) on content data, the present invention is not limited thereto and any of various information processing apparatus can be used so long as it is adapted to execute processes on content data for the portable reproduction apparatus  3  connected to it by way of a wire or wirelessly.  
      While the use of the CPU  30  of the portable reproduction apparatus  3  is described as a registration unit for registering content data identifying information shown in the data on the outcome (the data on the outcome of the write process and the data on the outcome of the delete process) that are written by the content processing apparatus for the content registration data (the number of times of reproduction database, the reproduction time zone database, new music database) where the identification information (data numbers) of content data is registered for the above embodiments for the purpose of executing the process sequences RT 1  and RT 2  according to the computer program installed in advance, the present invention is by no means limited thereto and any of various different arrangement may alternatively be used.  
      While the use of the hard disk drive  35  of the portable reproduction apparatus  3  is described above as a content storage unit for storing content data, as a processing result data storage unit for storing the data on the outcome of a process and as a registration data storage unit for storing content registration data for the above embodiments, the present invention is by no means limited thereto and some other storage medium such as a semiconductor memory or a disk-shaped storage medium may alternatively be used. Furthermore, the content storage unit, the processing result data storage unit and the registration data storage unit may be realized by separate respective storage mediums.  
      While the use of a personal computer  4  is described above as content writing apparatus for writing content data to the content storage apparatus for the above embodiments, the present invention is by no means limited thereto and any of various information processing apparatus can be used so long as it is adapted to be able to write content data to the portable reproduction apparatus  3  connected to it by way of a wire or wirelessly.  
      Finally, while the use of the hard disk drive  35  of the portable reproduction apparatus  3  is described above as a content registration data storage unit for storing content registration data (the number of times of reproduction database, the reproduction time zone database, the new music database) and also as a registration rule data storage unit for storing the registration rule (the registration rule information INF 1 ) for the above embodiment, the present invention is by no means limited thereto and some other storage medium such as a semiconductor memory or a disk-shaped storage medium may alternatively be used. Furthermore, the content registration data storage unit and the registration rule data storage unit may be realized by separate respective storage mediums.  
      As described above in detail, according to the invention, it is possible to store the music data transferred from an external apparatus such as personal computer in a local hard disk drive and utilize them in a portable reproduction apparatus adapted to reproduce any of the music data stored in the hard disk drive in response to an user operation.  
      It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.