A determination method for a production plan in which electronic circuit products having multiple types are produced, by using an electronic component mounting apparatus including multiple component feeders accommodating an electronic component, a nozzle corresponding to the electronic component, and a mounting head on which the nozzle is mounted and which is disposed to be relatively movable with respect to circuit boards, and by mounting the electronic component on each of the circuit boards having multiple types, wherein the production plan includes a setup change corresponding to each production process, which targets at least one among the component feeders respectively installed in multiple slots, the nozzle installed in a nozzle station, the nozzle mounted on the mounting head, and the mounting head detachably disposed in the electronic component mounting apparatus, and wherein the determination method characterized by comprising: an interposing-available candidate search process in which an interposing-available candidate in which an interruption production can be interposed within an initial production plan is searched for, when the interruption production is performed for a different electronic circuit product in the initial production plan for the electronic circuit products having multiple types; a time calculation process for a prior/posterior setup change, in which time for the prior/posterior setup change which is required for the setup change before and after the interruption production when the interruption production is interposed in the interposing-available candidate is calculated for each searched for interposing-available candidate, based on the production before and after the interposing-available candidate and the a production plan determination process in which based on the time for the prior/posterior setup change with respect to the respective interposing-available candidates, one interposing-available candidate is selected, and the interruption production is interposed in the interposing-available candidate selected in the initial production plan so as to determine the production plan. an interposing-available candidate search process in which an interposing-available candidate in which an interruption production can be interposed within an initial production plan is searched for, when the interruption production is performed for a different electronic circuit product in the initial production plan for the electronic circuit products having multiple types; a time calculation process for a prior/posterior setup change, in which time for the prior/posterior setup change which is required for the setup change before and after the interruption production when the interruption production is interposed in the interposing-available candidate is calculated for each searched for interposing-available candidate, based on the production before and after the interposing-available candidate and the a production plan determination process in which based on the time for the prior/posterior setup change with respect to the respective interposing-available candidates, one interposing-available candidate is selected, and the interruption production is interposed in the interposing-available candidate selected in the initial production plan so as to determine the production plan.