Method and device for controlling brightness of AR image

An electronic device according to an embodiment may include a memory storing computer executable instructions, a processor accessing the memory and executing the instructions, and a communicator receiving luminance information including a maximum luminance and a luminance setting value from at least one target device among one or more external devices identified by the electronic device, wherein the processor calculates a brightness value of the at least one target device based on the brightness information received from the at least one target device, and determines a brightness value of the AR image associated with the respective target device based on the brightness value of the at least one target device. 一种根据实施例的电子装置可包括：存储计算机可执行指令的存储器、访问存储器并执行所述指令的处理器、以及从由电子装置识别的一个或多个外部装置中的至少一个目标装置接收包括最大亮度和亮度设置值的亮度信息的通信器，其中，处理器基于从至少一个目标装置接收的亮度信息计算至少一个目标装置的亮度值，并且基于至少一个目标装置的亮度值来确定与相应目标装置相关的AR图像的亮度值。