1. An optimal operation pattern selection method for a motor, in which a plurality of selectable motors is selected and an optimal operation pattern is suggested from among motor operation patterns defined by positioning time to rotate a motor output shaft of the motor to rotate a load by a positioning angle and stop time to stop the motor output shaft, the method comprising: a simulation conditions input step of acquiring information of the simulation conditions including an input value of the positioning angle and an input value of inertia moment of the load as operating conditions, and at least one of an input value of required positioning time and an input value of required stop time as required conditions; a simulation step including calculating a total value of inertia moment by adding rotor inertia moment of a mechanical elements data information with the input value of the inertia moment of the load, for each of the selectable motors; and acquiring shortest positioning time to rotate the load by the input value of the positioning angle based on the total value of the inertia moment and torque characteristic information according to a rotational angular speed or a rotational speed included in the mechanical elements data information, and simulating an operation pattern under the simulation conditions for each of stored motors by simulating an operation pattern including the shortest positioning time for each of the motors; a comparison step including: obtaining an adaptability determination result of an item in the required conditions by comparing the shortest positioning time of the operation pattern for each of the motors obtained in the simulation step with the input value of the required positioning time under the required conditions, obtaining an adaptability determination result of an item in the operating conditions by comparing at least the input value of the inertia moment of the load included in the operation conditions with a predetermined threshold value, and among items of a plurality of determination results including at least the adaptability determination result of the item in the required conditions and the adaptability determination result of the item in the operating conditions, identifying and storing items having an adaptable determination result as adaptable items; and a comprehensive determination step of calculating a comprehensive determination results that varies according to combination of adaptable items obtained in the comparison step, and storing the comprehensive determination results linked to each of the motors; and a list display step of displaying, together with the comprehensive determination result stored in the comprehensive determination step, a list of the motors that enables to select of one of the motors; and selecting one of the motors from the list of the motors from the comprehensive determination results.