A server apparatus, a voice operation system, and a voice operation method, each of which: acquires, from an image forming apparatus, a language type of a display language used for display at the image forming apparatus; stores the language type of the display language; acquires, from a speaker, voice operation that instructs to change the display language; identifies a language type of a targeted language based on the voice operation; and determines whether the language type of the display language matches the language type of the targeted language. Based on a determination that the language type of the display language does not match the language type of the targeted language, the server apparatus instructs the image forming apparatus to change from the language type of the display language to the language type of the targeted language. Based on a determination that the language type of the display language matches the language type of the targeted language, the server apparatus disregards the instruction to change the language type of the display language of the image forming apparatus.