A portable terminal device comprising: incoming call signal reception means for receiving an incoming call signal including a caller number, caller information, and ring type information when an incoming telephone call is received, telephone dictionary registering means for generating caller text information using at least one of the caller information and the ring type information included in the incoming call signal, and registering the caller number included in the incoming call signal and the generated caller text information in a telephone dictionary managed in the portable terminal device in a manner such that they are associated with each other, incoming call screen display means for receiving the caller number, acquiring the registered caller text information corresponding to the received caller number from the telephone dictionary, and displaying an incoming call screen including the caller text information, incoming call history recording means for storing the caller number which is a source of a call and the caller text information as incoming call history information in a manner such that they are associated with each other, and incoming call history display means for displaying an incoming call history including a number of a source of the incoming telephone call and a name of the source of the incoming telephone call, and wherein: the telephone dictionary registering means is configured to delete, after the incoming telephone call ends, the caller number which the telephone dictionary registering means registered from the telephone dictionary, and the incoming call history display means is configured to acquire the caller text information from the incoming call history information and display the acquired caller text information as a name of the source of a call when displaying the incoming call history. incoming call signal reception means for receiving an incoming call signal including a caller number, caller information, and ring type information when an incoming telephone call is received, telephone dictionary registering means for generating caller text information using at least one of the caller information and the ring type information included in the incoming call signal, and registering the caller number included in the incoming call signal and the generated caller text information in a telephone dictionary managed in the portable terminal device in a manner such that they are associated with each other, incoming call screen display means for receiving the caller number, acquiring the registered caller text information corresponding to the received caller number from the telephone dictionary, and displaying an incoming call screen including the caller text information, incoming call history recording means for storing the caller number which is a source of a call and the caller text information as incoming call history information in a manner such that they are associated with each other, and incoming call history display means for displaying an incoming call history including a number of a source of the incoming telephone call and a name of the source of the incoming telephone call, and wherein: the telephone dictionary registering means is configured to delete, after the incoming telephone call ends, the caller number which the telephone dictionary registering means registered from the telephone dictionary, and the incoming call history display means is configured to acquire the caller text information from the incoming call history information and display the acquired caller text information as a name of the source of a call when displaying the incoming call history. the telephone dictionary registering means is configured to delete, after the incoming telephone call ends, the caller number which the telephone dictionary registering means registered from the telephone dictionary, and the incoming call history display means is configured to acquire the caller text information from the incoming call history information and display the acquired caller text information as a name of the source of a call when displaying the incoming call history.