PROBLEM TO BE SOLVED: To provide a positional information display service system allowing recognition of a group member and his/her location at a glance. SOLUTION: Each of portable terminals (a-e) 3-1 to 3-5 acquires positional information by using a GPS function and transmits the positional information to the server device 1 via a radio base station 2. The server device 1 previously stores user information of the respective portable terminals (a-e) 3-1 to 3-5 and generates a shared map shared between the group members in a specific area based on the positional information acquired from the respective portable terminals (a-e) 3-1 to 3-5 to provide it. The server device 1 makes the shared map display positions of the respective group members, and every time when the positional information is sent from each of the portable terminals (a-e) 3-1 to 3-5, the positions of the respective group members displayed on the shared map field are updated. COPYRIGHT: (C)2008,JPO&INPIT
