In a system of networked devices such as printers managed by a computer connected to them by a network, a method is described for executing device discovery and device status update at independent time intervals using a SNMP broadcast method while eliminating thread safety risk. Device discovery and status update are executed as subroutines within a main routine and each subroutine has its own decrement counter. The entire routine is repeated one cycle every time unit. In each cycle, the decrement counters are evaluated. If a counter is a positive value, the corresponding subroutine is skipped and the counter is decremented by one. If a counter is zero, the corresponding subroutine is executed and its counter is reset to the user-specified time interval afterwards.