JP2007065906A - Portable terminal equipment and character string processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the conversion efficiency of an input character string by utilizing various information inside its own device. <P>SOLUTION: A character string showing time is input by a key operation part 15, and when electronic settlement data, GPS data and schedule data stored in a storage part 12 has character information corresponding to time information shown by the time, a control part 17 calculates a dynamic conversion priority under the consideration of time coefficients corresponding to the time for the character information and similar character information, and merges the dynamic conversion priority with the priority of a normal dictionary, and displays conversion candidate character information(character string) in the order of the priority after to the merging operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a character string conversion technique used for creating a sentence on a mobile terminal device typified by a mobile phone.

  In a mobile terminal device represented by a mobile phone, the number of operation keys is limited depending on the size of the housing, and high-speed character input is difficult compared to operation with a full keyboard such as a personal computer. A technique for improving conversion efficiency when converting a character string input by a user into a desired conversion candidate character string is known.

  For example, Patent Literature 1 below discloses a character conversion device that improves conversion efficiency by converting an input character string based on environmental factors such as time.

JP 2003-296320 A

  By the way, recent portable terminal devices are provided with various functions, and various kinds of information are taken into the device every day through these various functions. At this time, various information in the mobile terminal device cannot be fully utilized.

  The present invention has been made in view of the above-described viewpoints, and an object of the present invention is to provide a portable terminal device and a character string processing method that improve the conversion efficiency of an input character string by utilizing various information in the device itself. Is to provide.

  In order to overcome the above-described problems, a first aspect of the present invention is to display a character string input screen on the display unit according to a predetermined operation on the display unit, the operation unit, and the operation unit, and A control unit that receives input of a character string from the operation unit via an input screen and displays the character string on the display unit; and a storage unit that stores a plurality of character information in association with time information, When a character string indicating a time period is input by the operation unit, the control unit refers to the storage unit and displays character information corresponding to time information indicated by the time period as a conversion candidate for the input character string. This is a portable terminal device.

  Preferably, when electronic settlement occurs, the control unit stores character information relating to the product for which the settlement has been made in the storage unit in association with the settlement time information.

  Preferably, the control unit stores character information indicating an event in the storage unit in association with a desired time designated as time information.

  Preferably, the information processing apparatus further includes a position information acquisition unit, and when the position information is acquired by the position information acquisition unit, the control unit associates character information related to the acquired position information with time information at the time of acquisition. Is stored in the storage unit.

  Preferably, the storage unit stores the analogy character information in association with one character information in advance, and the control unit receives a character string indicating a time period from the operation unit and indicates the time period When the character information corresponding to the time information is searched, the analogy character information is displayed as a conversion candidate for the input character string on condition that there is analogical character information corresponding to the character information.

  Preferably, when the character string indicating the time is input by the operation unit and the character information corresponding to the time information indicated by the time is searched, the control unit has a plurality of character information obtained by the search. In this case, the input character strings are displayed as conversion candidates for the character string in accordance with the order of weighting given to each character information.

  Preferably, the control unit increases the weighting of the plurality of character information obtained by the search in the order in which the time information corresponding to each character information is closer to the time information indicating the input time.

  Preferably, the position information acquisition unit is capable of executing spontaneous acquisition for acquiring position information in accordance with an instruction from the operation unit and automatic acquisition for acquiring position information regardless of the operation of the operation unit. When the character string indicating the time period is input by the operation unit and the character information corresponding to the time information indicated by the time period is searched, and there are a plurality of character information related to the position information, Acquisition of position information is displayed as conversion candidates for the input character string in preference to automatic acquisition of position information.

  In order to overcome the above problems, a second aspect of the present invention provides a character string process in a portable terminal device including a display unit, an operation unit, and a storage unit that stores a plurality of character information in association with time information. A method for displaying a character string input screen on the display unit in response to a predetermined operation on the operation unit, accepting an input of a character string by the operation unit via the input screen, and When a character string that is displayed on the display unit and indicates a time period is input by the operation unit, the storage unit is referred to and character information corresponding to the time information indicated by the time period is converted to the input candidate for the character string. As a character string processing method.

  ADVANTAGE OF THE INVENTION According to this invention, the conversion efficiency of an input character string can be improved using various information in a portable terminal device.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a system configuration diagram of a mobile phone 1 as an embodiment of the mobile terminal device of the present invention. FIG. 2 is a diagram illustrating an example of the appearance of the mobile phone 1 according to the embodiment.

  As shown in FIG. 1, the mobile phone 1 includes, as main functional blocks, a radio communication unit 11 including a transmission / reception antenna 111, a storage unit 12, an audio processing unit 13 including a speaker 131 and a microphone 132, a display unit 14, and key operations. Part 15, RFID part 16 including transmission / reception antenna 161, and control part 17.

The mobile phone 1 has a GPS (Global Positioning System) function and a schedule function, and these functional blocks are included in the control unit 17.
The mobile phone 1 also has an electronic payment function (so-called “electronic money”), and this function is executed mainly by the RFID unit 16 under the control of the control unit 17.

In FIG. 1, a wireless communication unit 11 performs a wireless communication operation via a base station, for example, a telephone number calling operation or an e-mail transmission / reception operation.
The wireless communication unit 11 includes a transmission / reception antenna 111, and modulates various data such as voice information and electronic mail processed by the control unit 17 in order to perform wireless communication using radio waves. Is transmitted (output) to a base station (not shown).
Further, the wireless communication unit 11 demodulates various data such as e-mail and voice information transmitted by radio from the base station and received by the transmission / reception antenna 111 and supplies the demodulated data to the control unit 17.

  The storage unit 12 includes a nonvolatile memory such as an EEPROM, and includes a control program for sending and receiving calls and mails, an Internet browser, message data, an address book in which names and telephone numbers are registered, and image data. Store (store) data.

The storage unit 12 stores normal dictionary data for character string conversion.
In the normal dictionary, the input character string is associated with the character string and priority of the conversion candidate. The priority (including dynamic conversion priority described later) corresponds to “weighting” of the present invention. When the character string is input, the control unit 17 displays the corresponding conversion candidate character strings on the display unit 14 in descending order of priority. This normal dictionary has a learning function for performing processing such as increasing the priority of a character string of a conversion candidate previously selected by the user.

The storage unit 12 stores character information such as text in association with time information for conversion of a character string input via the key operation unit 15. Here, the time information indicates not only the time but also comprehensive information that means time such as date, season, and year.
In this embodiment, “electronic payment data”, “GPS data”, and “schedule data”, which will be described later, will be described as character information associated with time information, but the present invention is not limited to this. The stored character information is referred to in character string conversion processing by the control unit 17.

The memory | storage part 12 contains the database which matched and memorize | stored character information and its analogy character information previously. The analogy character information can be anything as long as it is information related to the character information. For example, “Hachiko” can be analogy character information for “Shibuya” as character information.
The analogy character information is not necessarily 1: 1 with respect to the character information, and a plurality of analogy character information may be associated with one character information.
The database in which the analogical character information is stored is referred to in the character string conversion process by the control unit 17.

The audio processing unit 13 includes an audio processing circuit, and is connected to a speaker 131 that outputs audio for a call function and a microphone 132 that inputs audio.
The sound processing unit 13 performs predetermined processing such as encoding on the sound collected by the microphone 132 and supplies the processed sound to the control unit 17.
The audio processing unit 13 performs predetermined processing such as decoding on the audio information supplied from the control unit 17 and outputs the audio information from the speaker 131.

  As shown in FIG. 1, the display unit 14 has a display device such as a liquid crystal display (LCD) disposed on the upper part of the casing of the mobile phone 1. An image or the like is displayed on a display device.

The key operation unit 15 includes a plurality of input keys (hereinafter simply referred to as keys). As shown in FIG. 2, a plurality of keys include a web key 15a for connecting to the Internet, a mail key 15b for performing an e-mail function, a soft 1 key 15c and a soft 2 key 15f, up / down / left / right keys 15d, and processing. Enter key 15e for confirming, off-hook key 15g for speaking, clear key 15h, on-hook key 15i for ending, numeric keys "0" to "9", numeric keys corresponding to "*" and "#" 15j.
By the operation input to the key operation unit 15, a character string to be converted is input, and one character string is selected from a plurality of conversion candidate character strings.

The enter key 15e, the software 1 key 15c, and the software 2 key 15f are keys that have different operations in response to the display state of the display unit 14. The operation content for the operation is displayed at the bottom of the screen of the display unit 14.
The up / down / left / right key 15d is a key that can be operated in four directions of up / down / left / right. For example, when the display unit 14 displays a plurality of selection items as a list, the user can designate one selection item from among the plurality of selection items by operating the up / down / left / right key 15d.

  The key operation unit 15 has an input circuit, and transmits an electric signal to the control unit 17 through the input circuit when a user operation (pressing) on the above-described key is performed. The control unit 17 detects this electrical signal and executes processing corresponding to the operated key.

  The RFID unit 16 includes a non-contact IC card including a transmission / reception antenna 161 as a main part. This non-contact IC card operates as a transponder. When the control unit 17 operates the electronic payment function, electronic communication (for example, a product) is performed by performing RF communication with an external RFID reader / writer (not shown). Purchase). The data relating to the electronic payment is primarily stored in a memory such as an EEPROM in the non-contact IC card. Thereafter, the control unit 17 transfers the data stored in the EEPROM to the storage unit 12. Then, the character information (for example, the place of payment, the item, and the amount of money) relating to the product for which payment has been made is associated with the time information (for example, date and time information) for which payment has been made, and stored in the storage unit 12 as “electronic payment data”. .

  The control unit 17 is composed mainly of a microcomputer and controls the entire mobile phone 1. For example, the control unit 17 controls according to wireless transmission / reception of various information in the wireless communication unit 11, processing of voice information to the voice processing unit 13, display control of information on the display unit 14, and input information of the key operation unit 15. Processing, access control to the storage unit 12, and the like.

When the control unit 17 includes a GPS antenna and operates the GPS function, for example, from the radio waves received from a plurality of GPS satellites such as three, the radio wave propagation time and the orbit information of the satellites are acquired. Based on this information, the distance from the GPS satellite and the position of the GPS satellite are ascertained and the position information of itself is acquired. The acquisition of the self position information is based on automatic acquisition periodically performed regardless of the input of the key operation unit 15 by the user, or by spontaneous acquisition performed according to the input of the key operation unit 15 by the user. .
The control unit 17 associates character information (for example, text indicating a place name such as “Shin-Yokohama Station”) related to position information obtained by the GPS function with time information at the time of acquisition (such as the time when the GPS function is started), and stores Stored in the unit 12 as “GPS data”. At this time, the GPS data includes whether the position information has been acquired by automatic acquisition or spontaneous acquisition.
The control unit 17 is an embodiment of the position information acquisition unit of the present invention.

  When the control unit 17 operates the schedule function, for example, in response to an operation of the key operation unit 15 by the user, the control unit 17 sets character information indicating the event (for example, text related to the user's requirement) to the time related to the event. It is associated with information (for example, user desired time) and stored in the storage unit 12 as “schedule data”.

The control unit 17 performs input character string conversion processing.
That is, the control unit 17 displays a character string input screen on the display unit 14 in response to a predetermined operation on the key operation unit 15, and accepts input of a character string by the key operation unit 15 via the input screen. The input character string is displayed on the display unit 14. At that time, when a character string indicating a time is input, the electronic payment data, the GPS data, and the schedule data stored in the storage unit 12 are referred to, and there is character information corresponding to the time information indicated by the time The character information is displayed as a conversion candidate for the input character string. Then, when the user selects one conversion candidate from the conversion candidates via the key operation unit 15, the conversion of the input character string is confirmed.

When the character string indicating the time is not input, or even when the character string indicating the time is input, the control unit 17 indicates the current time in the electronic settlement data, GPS data, and schedule data stored in the storage unit 12. When there is no character information corresponding to the time information, conversion candidates (character strings) are displayed in order of priority based on a normal dictionary stored in advance in the storage unit 12.
On the other hand, when a character string indicating a time is input and the electronic payment data, GPS data, and schedule data stored in the storage unit 12 include character information corresponding to the time information indicated by the time, the character information includes On the other hand, a dynamic conversion priority, which will be described later, is calculated, merged with the priority of the normal dictionary, and conversion candidates (character strings) are displayed in the order of the priorities after the merge.

  Next, the character string conversion operation by the control unit 17 will be described with reference to the flowchart of FIG.

First, when a character string is input through the key operation unit 15 associated with a user operation (step ST1), the control unit 17 determines whether or not the input character string indicates “time” (step ST2). ). Here, time is a broad concept that represents time, and includes not only the year, month, day, time, and season, but also expressions such as “the day before yesterday” and “the day before”.
If the input character string indicates time, a “reference time” is calculated from the character string (step ST3). The reference time is time data that specifies the time indicated by the character string as a specific date and time.

Next, based on the character information corresponding to the time information indicated by the time, the control unit 17 refers to the database in the storage unit 12 to search for and specify analogy character information corresponding to the character information. Then, the dynamic conversion priority is calculated for all of the character information and its analogy character information (step ST4).
In order to calculate the dynamic conversion priority, first, with reference to the electronic payment data, GPS data, and schedule data stored in the storage unit 12, the character information corresponding to the time information and its analogy character information (hereinafter referred to as the character information) , Character information, etc.). Then, the process of step ST4 is repeated for all of the character information and the like.
In step ST4, first, a “time coefficient” based on the reference time calculated in step ST3 is calculated for character information and the like (step ST41). The time coefficient is a coefficient indicating a degree of whether the time information corresponding to the character information or the like is close in time or far from the reference time calculated in step ST3.

Next, the control part 17 calculates a dynamic conversion priority according to following formula (1) (step ST42).

Dynamic conversion priority = [word value] × [time coefficient] × [special value] (1)

In the above formula (1), the “word value” is a value indicating the degree to which each character information or the like is close to the character information itself. Of course, the word value of the character information itself is the largest value. This word value can be set from various viewpoints. For example, the analogy character information having a higher relevance to the reference character information has a larger value and the relevance of the character information is sparse. The smaller the information, the smaller the value.
The word value is set in advance in the database in the storage unit 12 or is calculated according to a predetermined rule every time a character string is input.

In the above formula (1), the “special value” is a value defined for each electronic payment data, GPS data, and schedule data referred to when searching for character information or the like. In other words, electronic payment data, GPS data, and schedule data have different uses depending on their functions, so that even if the time information is the same, the importance differs depending on the use. For example, in electronic payment data, a special value is changed according to the amount of payment.
This special value is calculated according to a rule defined in advance for each function.

  As described above, when the character string indicating the time is input, the electronic payment data, the GPS data, and the schedule data including the character information associated with the time information in the storage unit 12 are referred to, and the above-described expression (1) The character information is weighted in consideration of the time and the like related to the input according to the dynamic conversion priority calculated according to the above.

  When the dynamic conversion priority is calculated for all of the character information and its analogical character information, it is merged with the priority of the normal dictionary stored in advance in the storage unit 12 (step ST5), and the merged priority The conversion candidate character strings are displayed in this order (step ST6).

  Next, a specific example of the character string conversion operation by the control unit 17 will be described with reference to FIGS.

FIG. 4 is a diagram for explaining a specific example of word values. 4A shows an example of electronic payment data, GPS data, and schedule data stored in the storage unit 12, and FIG. 4B shows a word value for character information or the like (“word” in the figure). An example is shown.
For example, with respect to the character information “Shin-Yokohama Station” stored in the GPS data, the control unit 17 refers to the database in the storage unit 12, and as analogy character information related to “Shin-Yokohama Station”, “Yokohama Hotel”, Extract “Yokohama Museum”. In the database, the maximum value “5”, the character information (“Shin-Yokohama Station”), and the text “Yokohama” are common to the word value of “Shin-Yokohama Station”, which is the character information itself stored in the GPS data ( The word value of “Yokohama Hotel” to be “related” is “3”, and the word value of “Yokohama Museum” that is indirectly related geographically is “1”, although the text information (“Shin-Yokohama Station”) and the text itself are not related. It has become.

  FIG. 5 is a diagram for explaining an example of calculating the time coefficient according to the input character string. FIG. 5A shows an example of the time coefficient. FIG. 5B is the same diagram as FIG. FIG.5 (c) is the figure which extracted GPS data and electronic payment data from Fig.4 (a). FIG. 5D is a diagram showing an example in which time coefficients are assigned to character information and the like.

In the example shown in FIG. 5 (a), the time coefficient is set when “the day before yesterday” is input as the character string indicating the time and the current time at the time of the input is “January 4 13:00”. It is an example. In this case, the entire time range of “January 2” that is the day of “the day before yesterday” from the current time is the reference time. The time coefficient at the reference time is “2”, and the time coefficient other than the reference time is “0”.
In FIG. 5D, for example, in GPS data, the time coefficient of character information corresponding to “Shin-Yokohama Station” that matches the reference time is “2”, and character information corresponding to “movie theater” that does not match the reference time. Etc., the time coefficient is “0”.
In the case of prepaid electronic payment, the date and time when the product is actually received can be a future date and time when viewed from the reference time. This future date and time is reflected in the time coefficient.

  FIG. 6 is a diagram for explaining a calculation example of the special value and the dynamic conversion priority. FIG. 6A is the same diagram as FIG. FIG. 6B is a diagram illustrating a calculation example of the special value and the dynamic conversion priority. FIG. 6C is a diagram excerpting character information or the like whose dynamic conversion priority is not “0” and its dynamic conversion priority.

Here, in the case of GPS data, the special value when the position information as character information such as “Shin-Yokohama Station” is obtained by spontaneous acquisition is made larger than the special value when it is obtained by automatic acquisition. This is because if the user is interested in the position information and voluntarily acquires the position information, the position information is likely to be cited later by the user.
In the example shown in FIG. 6B, the special value for spontaneous acquisition (user positioning) is “2”, and the special value for automatic acquisition (automatic positioning) is “1”.

In the case of electronic payment data, the special value of character information corresponding to a high payment amount is set larger than the special value of character information corresponding to a low payment amount. This is because when a user makes a high purchase, it is considered that there is a high possibility that text information related to the purchase will be quoted later by the user.
In the example shown in FIG. 6B, the special value when the settlement amount is high (such as “shirt”) is “3”, and the special value when the settlement amount is low (such as “ticket”) is “1”. Yes.

  As described above, the dynamic conversion priority is calculated for the character information corresponding to the time information indicated by the time in the input character string and the analogy character information. In this example, FIGS. ) Is obtained. This calculation of the dynamic conversion priority corresponds to step ST4 in FIG.

FIG. 7 is a diagram illustrating an example of merging with a normal dictionary based on priority. FIG. 7 (a) is the same diagram as FIG. 6 (c). FIG. 7B is a diagram illustrating an example of priorities of the normal dictionary (learning dictionary). FIG. 7C shows the display order of final conversion candidates.
As shown in FIG. 7, the obtained dynamic conversion priorities and normal dictionary priorities are arranged in ascending order, and corresponding character information and the like are finally displayed as conversion candidates. This conversion candidate merging and display processing corresponds to steps ST5 and ST6 in FIG.

  Next, another specific example of the character string conversion operation by the control unit 17 will be described with reference to FIGS.

  FIG. 8 is a diagram for explaining a calculation example of the time coefficient according to the input character string. Data other than the setting example of the time coefficient is the same as that described in FIG. That is, FIGS. 8B to 8C are the same as FIGS. 5B to 5C, respectively.

FIG. 8A is an example of setting a time coefficient when “Saki” is input as a character string indicating a time and the current time at the time of input is “January 4 13:00”. . In this case, the time zone a little before the current time is the reference time, and in the example shown in FIG. 8A, the time coefficient “12: 0 to 13:00” close to the current time is set to the maximum “3”, The time coefficient of “11:00 to 12:00” is set to “2”, the time coefficient of “11:00 and before” is set to “1”, and the time coefficient is lowered every time the current time is distant.
5D, for example, in the GPS data, the time coefficient of the character information corresponding to “Shin-Yokohama Station” associated with the time information “January 2 12:00” is “0”. The time coefficient of character information or the like corresponding to “movie theater” associated with the time information of “January 4 10:00” is “1”.

FIG. 9 is a diagram for explaining a calculation example of the special value and the dynamic conversion priority. FIG. 9A is the same diagram as FIG. FIG. 9B is a diagram illustrating a calculation example of the special value and the dynamic conversion priority. FIG. 9C is a diagram excerpting character information or the like whose dynamic conversion priority is not “0” and its dynamic conversion priority.
The special value criteria for the GPS data and the electronic payment data are the same as those in the case of FIG. 6 described above. However, since the time coefficients are different, the dynamic conversion priority as shown in FIGS. Is different from the case of FIG.
Here, in FIG. 8D, the character information “movie theater” is specified from both the GPS data and the electronic payment data. In FIG. 9C, “movie theater” calculated separately is shown. The dynamic conversion priorities for character information are added together (“5 + 9 = 14”). In this case, the larger dynamic conversion priority may be selected.

  As described above, the dynamic conversion priority is calculated for the character information corresponding to the time information indicated by the time in the input character string and the analogy character information, and in this example, the value shown in FIG. Is obtained. This calculation of the dynamic conversion priority corresponds to step ST4 in FIG.

FIG. 10 is a diagram illustrating an example of merging with a normal dictionary based on priority. FIG. 10A is the same as FIG. 9C. FIG. 10B is a diagram illustrating an example of priorities of the normal dictionary (learning dictionary). FIG. 10C is a diagram illustrating a display order of final conversion candidates.
As shown in FIG. 10, the obtained dynamic conversion priorities and normal dictionary priorities are arranged in ascending order, and corresponding character information and the like are finally displayed as conversion candidates. This conversion candidate merging and display processing corresponds to steps ST5 and ST6 in FIG.

As described above, according to the mobile phone 1 according to the present embodiment, a character string indicating a time is input, and the time indicated by the time is stored in the electronic settlement data, GPS data, and schedule data stored in the storage unit 12. If there is character information corresponding to the information, a dynamic conversion priority is calculated for the character information and the analogy character information, taking into account the time factor according to the time, and the dynamic conversion priority is calculated. It merges with the normal dictionary priority, and displays the conversion candidate character information and the like (character string) in the order of the merged priorities.
Therefore, the character string conversion candidates input by the user are displayed in the optimum order by utilizing various information associated with the time information possessed by the mobile phone 1, and the character string conversion efficiency by the user is greatly improved. .
In the mobile phone 1 according to the present embodiment, the dynamic conversion priority calculated for determining the display order of the character string conversion candidates depends on not only time information but also various functions that the mobile phone 1 has. Since the special value is reflected, the display order of conversion candidates is suitable for the user.

The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, the character information associated with the time information is not limited to the electronic payment data, GPS data, and schedule data described above, and can be added and used according to the function added to the mobile phone 1.

1 is a system configuration diagram of a mobile phone according to an embodiment. It is the figure which illustrated an example of the external appearance of the mobile telephone which concerns on embodiment. It is a flowchart which shows the character string conversion operation | movement by the control part of the mobile telephone which concerns on embodiment. It is a figure for demonstrating the specific example of a word value. It is a figure for demonstrating the example of calculation of the time coefficient according to an input character string. It is a figure for demonstrating the example of calculation of a special value and dynamic conversion priority. It is a figure which shows an example of the merge with the normal dictionary based on a priority. It is a figure for demonstrating the example of calculation of the time coefficient according to an input character string. It is a figure for demonstrating the example of calculation of a special value and dynamic conversion priority. It is a figure which shows an example of the merge with the normal dictionary based on a priority.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mobile phone 11 ... Wireless communication part
111 ... Transmitting / receiving antenna 12 ... Storage unit 13 ... Audio processing unit
131 ... Speaker
132 ... Microphone 14 ... Display unit 15 ... Key operation unit 16 ... RFID unit
161: Transmitting / receiving antenna 17: Control unit

Claims (9)

A display unit;
An operation unit;
A character string input screen is displayed on the display unit in response to a predetermined operation on the operation unit, and a character string input by the operation unit is received via the input screen, and the character string is displayed on the display unit. A control unit to
A storage unit that stores a plurality of character information in association with time information,
When a character string indicating a time period is input by the operation unit, the control unit refers to the storage unit and sets character information corresponding to time information indicated by the time period as a conversion candidate for the input character string. A portable terminal device characterized by displaying. The mobile terminal device according to claim 1, wherein, when electronic payment occurs, the control unit stores character information related to a product for which payment is made in the storage unit in association with time information for payment. . The mobile terminal device according to claim 1, wherein the control unit stores character information indicating an event in the storage unit in association with a desired time specified as time information. A position information acquisition unit;
When the position information is acquired by the position information acquisition unit, the control unit stores character information related to the acquired position information in the storage unit in association with time information at the time of acquisition. Item 2. The mobile terminal device according to Item 1. The storage unit stores analogy character information in association with one character information in advance,
The control unit is configured such that when a character string indicating a time period is input by the operation unit and character information corresponding to the time information indicated by the time period is retrieved, there is analogical character information corresponding to the character information. The portable terminal device according to any one of claims 1 to 4, wherein the analogy character information is displayed as a conversion candidate for the inputted character string. When a character string indicating a time period is input by the operation unit and the character information corresponding to the time information indicated by the time period is searched, and the control unit has a plurality of character information obtained by the search, The portable terminal device according to any one of claims 1 to 5, wherein the mobile terminal device is displayed as a conversion candidate for the input character string in accordance with a weighting order assigned to each character information. The control unit increases the weighting of the plurality of character information obtained by the search in order of increasing time information corresponding to each character information to the time information indicating the input time period. 6. The mobile terminal device according to 6. The position information acquisition unit can execute spontaneous acquisition to acquire position information in accordance with an instruction from the operation unit, and automatic acquisition to acquire position information regardless of the operation of the operation unit,
When there is a plurality of pieces of character information related to position information when a character string indicating a time period is input from the operation unit and the character information corresponding to the time information indicated by the time period is searched, The mobile terminal device according to claim 4, wherein acquisition of information is displayed as a conversion candidate of the input character string in preference to automatic acquisition of information. A character string processing method in a mobile terminal device comprising a display unit, an operation unit, and a storage unit that stores a plurality of character information in association with time information,
In response to a predetermined operation on the operation unit, a character string input screen is displayed on the display unit.
Accept input of a character string by the operation unit via the input screen,
Displaying the character string on the display unit;
When a character string indicating a time period is input by the operation unit, the storage unit is referred to and character information corresponding to the time information indicated by the time period is displayed as a conversion candidate for the input character string. A character string processing method.

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