A camera usable while a plurality of accessory apparatuses (100, 300) are connected to the camera, the camera comprising a camera controller configured to control a communication with the plurality of accessory apparatuses (100, 300) using a signal transmission channel used for signal transmission between the camera and the plurality of accessory apparatuses (100, 300), and a data communication channel used for a data communication between the camera and the plurality of accessory apparatuses (100, 300), characterized in that the camera controller is configured to provide, using the data communication channel, a first communication for performing a data communication with the plurality of accessory apparatuses (100, 300), and a second communication for performing a data communication individually with a specific accessory apparatus designated as a communication counterpart by the first communication, outputs to the signal transmission channel a signal for instructing switching from the first communication to the second communication, performs the first communication at a first communication rate commonly usable for the camera and the plurality of accessory apparatuses (100, 300), performs the second communication at a second communication rate commonly usable for the camera and the specific accessory apparatus and equal to or higher than the first communication rate, performs the first communication at an initial communication rate determined between the camera and the plurality of accessory apparatuses (100, 300) and acquires usable communication rate information indicating a usable communication rate from each of the plurality of accessory apparatuses (100, 300), and sets the first communication rate and the second communication rate corresponding to each of the plurality of accessory apparatuses (100, 300), using the usable communication rate information. is configured to provide, using the data communication channel, a first communication for performing a data communication with the plurality of accessory apparatuses (100, 300), and a second communication for performing a data communication individually with a specific accessory apparatus designated as a communication counterpart by the first communication, outputs to the signal transmission channel a signal for instructing switching from the first communication to the second communication, performs the first communication at a first communication rate commonly usable for the camera and the plurality of accessory apparatuses (100, 300), performs the second communication at a second communication rate commonly usable for the camera and the specific accessory apparatus and equal to or higher than the first communication rate, performs the first communication at an initial communication rate determined between the camera and the plurality of accessory apparatuses (100, 300) and acquires usable communication rate information indicating a usable communication rate from each of the plurality of accessory apparatuses (100, 300), and sets the first communication rate and the second communication rate corresponding to each of the plurality of accessory apparatuses (100, 300), using the usable communication rate information.