An execution control method performed by a processor includes storing a first plurality of commands executed in the first computer and a first execution order in a memory; executing the first plurality of commands according to the first execution order when executed on the third computer; storing a second plurality of commands executed in the second computer and a second execution order in the memory; executing the second plurality of commands according to the second execution order when executed on the fourth computer; storing information generated by executing a command among the first plurality of commands and the second plurality of commands in the memory as configuration information each time the command is executed; and selecting a command among a first earliest command among unexecuted commands of the first plurality of commands and a second earliest command among unexecuted commands of the first plurality of commands, and executing the command.