An information processing device includes a reception unit that receives messages from terminals of a plurality of users constituting a group, a storage unit that stores reception times of the messages, a transmission unit that transmits the message, to a terminal of at least one user, a specification unit that specifies an unread message for which a reception time difference for a predetermined number of continuous messages, among a plurality of the unread messages, satisfies a predetermined condition, as a trigger message, based on the reception time of an unread message for which read information is not received from the terminal of the user, the read information indicating that the message has been viewed, and a generation unit that generates display information for displaying information regarding the trigger message on a display unit of the terminal of the user.