1. An information setting method for a plurality of electronic devices, comprising: a generating step of referring to a set of common setting items which is a collection of setting items of a plurality of electronic device models, and generating an entry screen which enables a user who wishes to use one of the plurality of electronic devices to make settings for the set of common setting items, wherein the user displays high priority common setting items on a main screen, and the user displays low-priority common setting items on a second screen; a receiving step of receiving a plurality of setting values entered from the entry screen by the user; a storage step of associating each of the received setting values with a corresponding common setting item and with the order in which the user entered the one of the plurality of setting values, and storing the resulting information in a common setting storage unit, wherein the user changes one of the set of common setting items while maintaining the order in which the user entered one of the plurality of setting values; a prioritizing step of giving priority to setting one of the low-priority common setting items over one of the high priority common setting items if an initial value is set for the one of the low-priority common setting items earlier in time than the initial value for the one of the high priority common setting items; and a further prioritizing step of giving priority to a first common setting item over a second common setting item if the first common setting item is set later in time than the second common setting item and the first common setting item is of the same priority category as the second common setting item; a converting step of reading, for generating setting information for one of the plurality of electronic device models, each of the plurality of setting values from the common setting storage unit, referring to constrain information that is dependent on the order in which the user entered each of the plurality of setting values from the common setting storage unit and is to be applied to the one of the plurality of electronic device models, and converting each of the read setting values to a converted setting value to be set for the one of the plurality of electronic device models, and confirming with the user setting values that changed and confirming with the user prior setting values prior to the change in the setting values.