A method and electronic device for receiving input and outputting characters based on sound stroke patterns are described. Each computer includes, on an agent platform 2, an agent base 9 capable of having a shell agent 10, a local service agent 11 and an application agent 12, an agent movement unit 13, thread generating unit 14, remote control unit 15 and agent generating unit 16. The flight attendant then says one or more specific words stored as a vocabulary within the personal alert unit. One bus line is dedicated to a clock signal.