Abstract: This application discloses a program execution method, which may be applied to the field of program processing. The method includes: receiving a call request of a first program for a small stub function; loading the small stub function based on the call request; and determining, based on the small stub function, whether to load a complementary real function corresponding to the small stub function. A function that may actually need to be called by the first program is the complementary real function, and the small stub function may be understood as a buffer for loading the complementary real function. Whether to load the complementary real function can be controlled through addition of the buffer, so that a requirement of the first program for a running memory can be reduced.