| 摘要 |
PROBLEM TO BE SOLVED: To enable recognition of an expanded battery pack at any terminal, in such a system that a terminal that can detect the expansion of a battery pack by itself and a terminal that cannot detect it coexist.SOLUTION: A remote control terminal 30a, in the case that expansion of an attached battery pack 50 is detected, notifies a karaoke device 10 of first information on deterioration of the battery pack 50. The karaoke device 10 registers the first information received from the remote control terminal 30a to a battery database of a host server 40. A remote control terminal 30b notifies the karaoke device 10 of second information on the attached battery pack 50. The karaoke device 10, in the case that the first information corresponding to a battery ID indicated by the second information received from the remote control terminal 30b has been already registered to the battery database, transmits notification information indicating deterioration to the remote control terminal 30b. The remote control terminal 30b that receives the notification information indicating deterioration from the karaoke device 10 displays alarm information. |
