A multi-core system includes: a first core that writes first data by execution of a first program, wherein the first core gives write completion notice after completion of the writing; a second core that refers to the written first data by execution of a second program; and a scheduler that instructs the second core to start the execution of the second program before the execution of the first program is completed when the scheduler is given the write completion notice from the first core by the execution of the first program.