Numerical controller

A numerical controller comprising:

• a memory configured to store a plurality of subprograms;
• and
• a processor configured to:
• control a machining tool to machine a workpiece by executing a machining program;
• and
• analyze the machining program by:
• determining a first information related to a call of at least one subprogram of the plurality of subprograms in a case where the call of the at least one subprogram is included in the machining program,
• storing the first information related to the call of the at least one subprogram,
• in response to execution of the at least one subprogram during the execution of the machining program, determining a second information related to execution of the at least one subprogram, storing the second information, and combining the second information with the first information,
• wherein the second information related to the execution of the at least one subprogram includes information on an execution frequency that is a percentage of times that the at least one subprogram is executed with respect to a number of times the program is executed, and an execution time of the at least one subprogram,
• form a primary name list of all the subprograms stored in the memory, by adding the first information and the second information to the primary name list, and
• form and display a secondary name list including:
• a subprogram that is reserved to be called by interpreting a code in the machining program, and is not executed, and
• a subprogram that is not reserved to be called and is never called by another program.