In a communication system, an information processing apparatus communicates with an information management apparatus via polling communication. In the information management apparatus, specification information including information specifying a timing condition of polling communication is stored, and the specification information is transmitted to the information processing apparatus in response to a request from the information processing apparatus. Transmission of the specification information is performed each time the request is issued via polling communication by the information processing apparatus when the specified timing condition is met. In the information processing apparatus, if the specification information is received, the timing condition is set such that next polling communication is performed when the time condition specified by the specification information is met. The polling communication is started when the timing condition set by the setting unit is met to request the provision of specification information specifying the timing condition of further next polling communication.