A lens apparatus is switchable between first and second modes. A control master determination unit a lens apparatus as one of a master and a slave when the lens apparatus is operated in the second mode. A command value transmit-receive unit transmits/receives a command value of a target of the lens apparatus to/from another lens apparatus in the second mode, wherein the lens apparatus drives the target according to a command value from a controller for the lens apparatus for the target for which the lens apparatus is the master, and drives the target according to a command value received through the command value transmit-receive unit for the target for which the lens apparatus is set as the slave.