Method for entering group event through instant messaging application

An operation method of a user terminal for participating in a group event through an instant messaging application, the method comprising:

• receiving, by the user terminal, a group event invitation message through the instant messaging application, the group event invitation message identifying a group event and an event start time of the group event, the group event invitation message including information about at least one user account invited to the group event;
• receiving, by the user terminal, a response to the group event invitation message from a user of the user terminal;
• displaying the information about the at least one user account on the display of the user terminal;
• displaying an invitation response result from each user who received the group event invitation message on the display;
• in response to the user accepting the group event invitation message, transmitting, by the user terminal, an acceptance message through the instant messaging application;
• and
• in response to the transmitting the acceptance message, receiving, by the user terminal, a group event participation request through a chatroom related to the group event of the instant messaging application at a time corresponding to the event start time identified by the group event invitation message, the group event participation request being a push notification;
• and
• displaying a call incoming screen of the instant messaging application on the display,
• wherein the receiving of the group event participation request includes receiving, by the user terminal, the group event participation request from an information processing system, the information processing system being separate from the user terminal,
• wherein the group event participation request is automatically transmitted by the information processing system at the time corresponding to the event start time to the user terminal and at least one of other user terminals which have sent acceptance messages through the instant messaging application,
• wherein a call channel is formed so that the user terminal is able to make a call through the instant messaging application in response to receiving a user input on the call incoming screen of the instant messaging application,
• wherein the group event invitation message further includes information about an event type, and
• wherein the method further comprises
• providing at least one of a visual effect or a sound effect to the group event, or an additional function within the group event based on the information about the event type.