1. A non-transitory computer-readable recording medium having stored therein a program-execution control program for causing a computer to execute a program-execution control process by converting at least a portion of a byte code program into a native code, the program-execution control process comprising: a first conversion process of converting, when executing an execution-target program that is a program to be executed via the program-execution control program, a byte code in the execution-target program into a native code, based on a predetermined condition; a determination process of determining, upon activating the execution-target program, whether the execution-target program is an optimization-completed program having a past record of having been converted into an optimized state of the execution-target program, based on a profile that includes identification information identifying the optimization-completed program and optimized-code information indicating an optimized code for the optimization-completed program, the profile being updated at a program-execution timing of executing the program-execution control program or another program-execution control program, the optimized code being generated by converting a byte code into a native code; and a second conversion process of converting, when the execution-target program is the optimization-completed program, a byte code corresponding to the optimized-code information indicating the optimized code from among byte codes of the execution-target program, into a native code, upon activating the execution-target program.