A subscriber terminal service system, which has a switchboard connected to a plurality of subscriber terminals and a computer connected with the switchboard and executes services to subscribers, has the functions of setting a flag indicative of the possibility/impossibility of the execution of an application on the basis of a message sent from the computer, referring to the flag in response to a service request sent from the subscriber terminal to determine whether or not the execution of the requested application should be permitted, sending a control message to the switchboard when the condition of possibility/impossibility of the execution of an application on the computer, and changing the content of the flag in the switchboard on the basis of the control message. The start or stop of any application executed in the computer is made through a console device connected with the computer or by a scheduler provided in the computer.