An execution control method that causes a computer to execute a process, the process includes generating a first regression line that indicates a correlation between a reception time point of each of a plurality of event messages received in a first time period and a generation time point of each of the plurality of event messages, calculating, for each of the plurality of the event messages, a first difference between the generation time point of each event message and a value on the first regression line corresponding to the reception time point of each event message, and determining, based on a margin time in accordance with the calculated first difference, a notification time point to be added to a control message indicating a communication state of the plurality of event messages.