A communication portion of a video camera receives expected power
information of a printer from the printer, and also receives battery
power information from a battery pack. When a microcomputer judges that
there is any shift to a state where the power consumption amount under
operating state is varied, that is, the printer is under a print standby
state for printing operation, an operating portion reads out expected
power information of the video camera under operation of the printer
which is stored in advance is read out from the storage portion to
calculate the expected power consumption amount of a video camera system
under the operation of the printer on the basis of the expected power
information of the printer received by the communication portion and the
expected power information of the video camera read out, and the battery
residual amount time is determined on the basis of the expected power
consumption amount.