Transfer method and transfer system for transferring substrate between transfer device and substrate stage

A transfer method comprising:

• providing a substrate stage including a plurality of holders configured to hold a plurality of substrates and serving as a transfer destination or a transfer source of the plurality of substrates;
• providing a transfer device including a plurality of forks configured to hold and transfer the plurality of substrates to and from the substrate stage;
• acquiring positional information of the transfer device and positional information of the substrate stage;
• calculating a relative position of the transfer device and the substrate stage when the transfer device is moved to a position where the plurality of substrates is delivered between the transfer device and the substrate stage, based on the positional information of the transfer device and the positional information of the substrate stage acquired in the acquiring;
• determining whether there is a risk for an abnormal contact causing a breakage of a substrate when the plurality of substrates are delivered between the transfer device and the substrate stage, based on the relative position calculated in the calculating;
• and
• when determined that there is a risk for the abnormal contact, displaying the risk for the abnormal contact on a display to notify a user of the risk for the abnormal contact according to the determination at the determining.