To shorten a communicating time when communication information to be communicated this time is associated with the previous communication information in a camera capable of communicating with any equipment outside the camera.

In the case of performing communication between a serial communicating means a 16 of a camera main body 1 and a serial communicating means b l7 of a camera controller 2 as outside equipment, when a difference between address information to be communicated this time and the previously communicated address information is within a prescribed value, the difference of those addresses is communicated.