The invention is to provide a technique for improving the usage efficiency of user licenses in an environment in which the simultaneous connection number of users is limited. This invention comprises: determining a predetermined allowable time based on a task selected by a user and an attribute of the user; and forcibly making the user log off in a case where it is detected that data relating to the selected task is not inputted or received for a time exceeding the predetermined allowable time. Thus, the time until the logoff is forcibly performed is automatically and suitably set according to, for example, the task conducted by the user or a department to which the user belongs.