information processing system vs data processor

information processing system and data processor both are nouns.

Word	Noun	Adjective	Verb	Adverb
information processing system	Yes	No	No	No
data processor	Yes	No	No	No

As nouns, information processing system and data processor are synonyms defined as:

information processing system and data processor: a machine for performing calculations automatically

Other synonyms of information processing system include computer, computing device, computing machine, electronic computer.

information processing system (noun)	data processor (noun)
a machine for performing calculations automatically	a machine for performing calculations automatically