A control apparatus for controlling a digital video apparatus using
Universal Serial Bus, comprises a storage unit which stores a control
program and a control unit which executes the control program. The
control program controls (a) step of judging whether a response to a
first request for requesting to change a status of the digital video
apparatus to a predetermined status is an ACK or not, (b) a step of
judging, if the response is the ACK, whether notification information is
received or not before a lapse of a predetermined time, the notification
information notifying the control apparatus that the status of the
digital video apparatus is changed, and (c) a step of transmitting, if
the notification information cannot be received before the lapse of the
predetermined time, a second request for requesting information
representative of the status of the digital video apparatus to the
digital video apparatus.