To provide an operation terminal, an information providing device and each method for enabling a plurality of users to perform access from a common group account to information resources by making the users independently perform access properly according to the access right of each user, and for enabling the users to share the information resources while integrally securing them.

This information sharing system is configured to make a plurality of users perform access from a common group account, and to allow the users each other to share information resources. This information sharing system is provided with a user setting means for making each user apply for the approval of user information related with the user from a privilege account for every group account to which each user is belonging, and for setting it as the approved user information, a user authenticating means for making the user request user authentication from the group account for the user information to permit the user to perform access and a monitor means for monitoring the execution process of access, and for recording it in a log file for each user.