Abstract: A group marketing system, a group marketing device and a group marketing method thereof are provided. The group marketing system includes a data collecting device and a group marketing device. The data collecting device has a connection with the group marketing device and is configured to collect group data. The group marketing device is configured to store specific product customer data, receive the group data, generate group relation data according to the group data, generate group preference analysis data according to the group relation data and the specific product customer data, generate product data according to the group preference analysis data, and transmit the product data to an electronic device.

Abstract: A social activity planning method includes the following operation. A database storing multiple candidate invitees with their geographical locations and interest scores towards a topic, and a social graph including vertices representing the candidate invitees and edges connecting two vertices representing mutual acquaintance of the associated candidate invitees is accessed. A social activity request including an invitation number, information about a social activity, and a familiarity condition for the social activity request is received. At least one feasible solution including the invitation number of the candidate invitees and meeting the familiarity condition is generated. A group of selected invitees are found based on the feasible solution and the information about the social activity.

Abstract: A social activity planning method includes the following operation. A database storing multiple candidate invitees with their geographical locations and interest scores towards a topic, and a social graph including vertices representing the candidate invitees and edges connecting two vertices representing mutual acquaintance of the associated candidate invitees is accessed. A social activity request including an invitation number, information about a social activity, and a familiarity condition for the social activity request is received. At least one feasible solution including the invitation number of the candidate invitees and meeting the familiarity condition is generated. A group of selected invitees are found based on the feasible solution and the information about the social activity.