Information transmission requests are delivered to communication terminals existing in a specific area, to collect information held in the communication terminals, without inducing congestion. In an information collecting device included in an information collecting system, terminal information and capacity information are acquired based on base station identifying information, and information of an information amount of collected information is further acquired based on a collected information type that identifies a type of the collected information. In an information collection controlling unit, transmission timing information, designating the timing at which a capacity of performing communication via a base station is not exceeded, is generated based on the terminal information, the information-amount information and the capacity information, and an information transmission request including the transmission timing information is delivered to a communication terminal.