Provided is a storage system including a host device and a storage device connected to the host device through multiple paths and configured to perform hot-swap of firmware. The host device generates and sends an inquiry command to inquire about whether to allow firmware exchange. In response to the command, the storage device generates information about whether to allow firmware exchange in a control unit connected to a path where the command is received, as response information to the inquiry command and sends the generated information to the host device. The host device determines whether to allow firmware exchange in accordance with the received response information, and if firmware exchange is enabled, generates information about multiple paths with the storage device.