An anti-worm program allows a computer to execute control of communication suspected as worm communication, the program allowing the computer to execute: a communication information acquisition step that acquires communication information which is information concerning communication from a target source; and a communication control step that has a control amount calculation formula for calculating the control amount of the communication from the target source using the communication information and performs control of the communication from the target source based on the communication control amount obtained using the control amount calculation formula.