| 摘要 |
PROBLEM TO BE SOLVED: To reduce a system load by transmitting only data of a necessary field having a change to a server when saving a data file to be erased from a mobile terminal device to the server.SOLUTION: In a mobile terminal device 2, when a record of a data file 231 is updated, a CPU 21 decides whether a field changed by the update is a change notification necessary field or not based on a change notification necessary field management table 234, and stores a data storage position of the updated record in a difference data management table 235 when deciding that it is the change notification necessary field. When the data file 231 is erased, the record in which the change notification necessary field is changed is transmitted to the server by a wireless communication part 26. |
