An information processing apparatus includes a central processing unit (CPU) that: transmits and receives a message via a network; manages the message received; discriminates reply necessity to the message being managed; discriminates a message type according to a content of the message discriminated as a message that requires a reply; and calculates an estimated time required by a recipient of the message to reply to the message according to the message type discriminated. The information processing apparatus further includes a user interface that displays the estimated time before displaying the message.