An event notification method, comprising: receiving an event subscription request from a subscriber, the event subscription request comprising one or more notified parties; dividing the one or more notified parties into one or more groups, each group of the one or more groups comprising one or more notified parties; and sending an event notification to notified parties in at least one group of the one or more groups, sending an event notification to notified parties in at least one group of the one or more groups comprises: determining whether an event notification rule is satisfied, and in a case where the event notification rule is satisfied, sending an event notification to notified parties in at least one group of the one or more groups, characterized in that, after an event notification is sent, determining whether a re-notification criterion is satisfied, and in a case where the re-notification criterion is satisfied, sending an event notification to notified parties in at least one group of the one or more groups, wherein a group to which an event notification is sent in the case where the event notification rule is satisfied is denoted as an initial-notification group, and a group to which an event notification is sent in the case where the re-notification criterion is satisfied is denoted as a re-notification group, and the initial-notification group is different from the re-notification group. receiving an event subscription request from a subscriber, the event subscription request comprising one or more notified parties; dividing the one or more notified parties into one or more groups, each group of the one or more groups comprising one or more notified parties; and sending an event notification to notified parties in at least one group of the one or more groups, sending an event notification to notified parties in at least one group of the one or more groups comprises: determining whether an event notification rule is satisfied, and in a case where the event notification rule is satisfied, sending an event notification to notified parties in at least one group of the one or more groups, characterized in that, after an event notification is sent, determining whether a re-notification criterion is satisfied, and in a case where the re-notification criterion is satisfied, sending an event notification to notified parties in at least one group of the one or more groups, wherein a group to which an event notification is sent in the case where the event notification rule is satisfied is denoted as an initial-notification group, and a group to which an event notification is sent in the case where the re-notification criterion is satisfied is denoted as a re-notification group, and the initial-notification group is different from the re-notification group. determining whether an event notification rule is satisfied, and in a case where the event notification rule is satisfied, sending an event notification to notified parties in at least one group of the one or more groups, characterized in that, after an event notification is sent, determining whether a re-notification criterion is satisfied, and in a case where the re-notification criterion is satisfied, sending an event notification to notified parties in at least one group of the one or more groups, wherein a group to which an event notification is sent in the case where the event notification rule is satisfied is denoted as an initial-notification group, and a group to which an event notification is sent in the case where the re-notification criterion is satisfied is denoted as a re-notification group, and the initial-notification group is different from the re-notification group.