The touch-screen monitors are used by visitors to check the Parliament agenda and other political activities.
House Secretary-General Nining Indra said the unwanted interruption was probably caused by someone trying to access a porn site on the computer system.
She said officials would use close circuit TV footage to investigate.
Indonesia is the world's most populous Muslim nation. Authorities have been trying to crack down on porn ahead of the holy fasting month of Ramadan that starts next week.