Various embodiments provide methods and apparatus for operating a browser engine, and related browsers and terminals. When starting a browser, an operating environment of the browser can be obtained. The operating environment can include a CPU environment in a browser-installed-terminal. A matched operation mode of the browser engine can be selected according to the operating environment. The selected operation mode can be used to operate the browser engine. Exemplary apparatus for operating the browser engine can include an obtaining module, a selection module, and an operation module. Various embodiments also provide a browser including the disclosed apparatus, and a terminal including the disclosed browser.