The lens apparatus diagnostic system, the diagnostic program, the record medium, the lens diagnostic system and the controller diagnostic system have the effects of, by connecting a personal computer to a TV lens and having a diagnosis of the TV lens performed by the personal computer performing communication with the TV lens, implementing the diagnosis of the TV lens with an inexpensive system without necessity of providing a dedicated substrate for self-diagnosis to the TV lens and also capable of the diagnosis of an ENG lens. The personal computer is connected to the lens by an RS232C interface, and a program of an FIND system preinstalled on the personal computer is started. The FIND system allows a diagnostic mode for performing the diagnosis of the lens, a personal computer control mode for controlling the lens and so on to be selected, and the diagnosis of the lens is performed by the personal computer by selecting the diagnostic mode.