An image capturing apparatus to which an accessory apparatus is attachable, the image capturing apparatus comprising: a communication control section configured to control transmission of a signal to the accessory apparatus through a first communication channel (LCLK/RTS), transmission of data to the accessory apparatus through a third communication channel, and reception of data from the accessory apparatus through a second communication channel, characterized in that the communication control section is configured to control communication so as to receive first accessory attribute information (FIG. 6: 1-20) of the accessory apparatus through the second communication channel by using a first communication method (M1-F1), then switch from the first communication method to a second communication method (M1-F2, M2, M3) different from the first communication method, and receive second accessory attribute information (FIG. 6: 21) of the accessory apparatus through the second communication channel by using the second communication method, the first communication method is a communication method in which, at a timing corresponding to transmission, through the first communication channel, of a clock signal of which a signal level switches alternately between a first signal level and a second signal level different from the first signal level, transmission of data through the third communication channel and reception of data through the second communication channel are performed, and the second communication method is a communication method not using a clock signal in which, in response to reception, through the second communication channel, of data transmitted in response to switching of the signal level of the first communication channel from the first signal level to the second signal level, transmission of data is performed through the third communication channel, wherein the second accessory attribute information contains information indicating a function that can be performed by the second communication method which is not included in the first accessory attribute information. a communication control section configured to control transmission of a signal to the accessory apparatus through a first communication channel (LCLK/RTS), transmission of data to the accessory apparatus through a third communication channel, and reception of data from the accessory apparatus through a second communication channel, characterized in that the communication control section is configured to control communication so as to receive first accessory attribute information (FIG. 6: 1-20) of the accessory apparatus through the second communication channel by using a first communication method (M1-F1), then switch from the first communication method to a second communication method (M1-F2, M2, M3) different from the first communication method, and receive second accessory attribute information (FIG. 6: 21) of the accessory apparatus through the second communication channel by using the second communication method, the first communication method is a communication method in which, at a timing corresponding to transmission, through the first communication channel, of a clock signal of which a signal level switches alternately between a first signal level and a second signal level different from the first signal level, transmission of data through the third communication channel and reception of data through the second communication channel are performed, and the second communication method is a communication method not using a clock signal in which, in response to reception, through the second communication channel, of data transmitted in response to switching of the signal level of the first communication channel from the first signal level to the second signal level, transmission of data is performed through the third communication channel, wherein the second accessory attribute information contains information indicating a function that can be performed by the second communication method which is not included in the first accessory attribute information.